F-789SGA SCIENTIFIC CALCULATOR USER INSTRUCTIONS E-IE-455 ENGLISH
Contents Display ...............................................................................................................P.2 Getting Started Power On, Off ...........................................................................................P.3 Display Contrast Adjustment .....................................................................P.3 Mode Selection ..................................................................................... P.3-4 Application Function Menu (Apps Key) ..........
How to Use the Slide Cover Open or close the cover by sliding as shown in the figure.
Getting Started Power On, Off First time operation: 1. Remove the battery insulation tab to load the battery. 2. Press to initialize the calculator. Power ON: When Power OFF: is pressed. are pressed. Auto Power off Function: When the calculator is not used for approximately 7 minutes, it will automatically power off. Display Contrast Adjustment Press (6: CONT ), to enter the Display Contrast Adjustment screen. Press Press Press to darken the display contrast. to lighten the display contrast.
Operation LCD Indicator Mode COMP Normal calculations CPLX Complex number calculation CPLX STAT STAT BASE Statistical and regression calculations Calculations involving specific number systems EQN Equation solution EQN TABLE Function table generation MATX Matrix calculations MATX VCTR Vector calculations VCTR The default mode is COMP mode. Application Function Menu (Apps Key) Apps The Apps menu contains mathematical functions.
v) EQN Mode Press [ ] or [ ] key vi) MATX Mode Press [ ] or [ ] key vii) VCTR Mode Press Apps Apps to exit the Apps menu. Calculator Set-up Menu Press press / to enter the Calculator Set-up Menu; for next / previous page. Press [ ] or [ ] key To select the calculator input & output format [1] Maths or [2] Line [1] Maths – (Mathematics mode): Mathematics mode The majority of calculation input and output (e.g. Fraction, pi, square root number) are shown in Mathematics textbook format.
To select the angle unit [3] Deg, [4] Rad or [5] Gra [3] Deg: Angle unit in Degree [4] Rad: Angle unit in Radian [5] Gra: Angle unit in Gradient 90º = radians = 100grads To select display digit or notation [6] Fix, [7] Sci or [8] Norm [6] Fix: Fixed Decimal, [Fix 0~9?] appears, specify the number of decimal places by pressing [0] – [9]. Example: 220 ÷ 7 = 31.4286 (FIX 4) = 31.43 (FIX 2) [7] Sci: Scientific Notation, [Sci 0~9?] appears, specify the number of significant digits by pressing [0] – [9].
To select the statistical display format [4] STAT ([1] ON or [2] OFF) [1] ON: Show FREQ (Frequency) Column in Statistical Data Input Screen [2] OFF: Hide FREQ (Frequency) Column in Statistical Data Input Screen To select the decimal point display format [5] Disp ([1] Dot or [2] Comma) [1] Dot: specify dot format for Decimal point result display [2] Comma: specify comma format for Decimal point result display To Adjust Display contrast [6] CONT Refer to the “Display Contrast Adjustment” section.
Inputting Expressions and Values Input Capacity F-789SGA allows you to input a single calculation with up to 99 bytes. Normally, one byte is used each time you press one of the numeric keys, arithmetic keys, scientific function keys or . Some functions require 4 – 13bytes. , , and the direction keys will not use up any bytes. When the remaining input capacity is less than 10bytes, the input cursor will change from “ ” to “ ” signaling that the memory is running now.
*2. Scientific functions come with the open parenthesis. Example: sin(, cos(, Pol(, LCM(…. You need to input the argument and the close parenthesis . *3. Omit the last close parenthesis before the , , , and . Insert and Overwrite Input mode In Line mode, you can use INSERT or overwrite mode for inputting. - In Insert mode (Default input mode), the cursor is a vertical flashing line “ ” for inserting a new character.
(3) Insertion (889900 Line/Maths mode - 2889900) 6times Insert mode 1234567+|889900 1234567+2|889900 Inputting and Display Result in Mathematics Mode In Mathematic Mode, the input and display result of fraction or certain functions (log, x2, x3, x , , 3 , , x-1, 10 , e , Abs) is shown in Handwriting/Mathematics format. MATHEMATICS MODE: Example Key in operation Display NOTE (1) Some input expressions cause the height of a calculation expression to be greater than one display screen.
Function Calculation Input Ranges Functions sinx cosx tanx sin-1x cos-1x tan-1x sinhx Input Range DEG 0 |x| <9×109 RAD 0 |x| <157 079 632.7 GRA 0 |x| <1x1010 DEG 0 |x| <9×109 RAD 0 |x| <157 079 632.7 GRA 0 |x| <1x1010 DEG Same as sinx, except when |x| =(2n-1)×90 RAD Same as sinx, except when |x| =(2n-1)× /2 GRA Same as sinx, except when |x| =(2n-1)×100 0 |x| 1 0 |x| 9.
Functions Pol(x,y) Rec(r, ) Input Range |x|,|y| 9.999 999 999x1099 x2+y2 0 9.999 999 999x1099 r 9.
Functions Mod(x,y) Single-variable Input Range 0<|x,y| 9.
Order of Operations This calculator will automatically determine the operation priority of each individual command as follows:1st Priority Recall memory (A, B, C, D, E, F, 0-9), Rand 2nd Calculation within parentheses ( ).
In the same precedence level, calculations are performed from left to right. Operations enclosed within parentheses are performed first. When a calculation contains an argument that is a negative number, the negative number must be enclosed within the parentheses. Example: –22 = –4 (–2)2 = 4 When same priority commands are mixed into one calculation: Example 1: 1÷2 = 0.
Cause Action Math ERROR Error Message • The intermediate or final result is outside the allowable calculation range. • An attempt to perform a calculation using a value that exceeds the allowable input range. • An attempt to perform an illogical operation (division by zero, etc.) • Check the input values and make sure they are all within the allowable ranges, Pay special attention to values in any using memory areas Stack ERROR • The capacity of the numeric stack or operator stack is exceeded.
Basic Calculations Press to enter COMP mode. As the calculation is busy processing, the calculator shows the message [PROCESSING] (without any calculation result). Press key to interrupt the calculating operation. Arithmetic Calculations • To calculate the negative values (exclude the negative exponent) enclose then within the parentheses. • This calculator supports 99 levels of parenthetical expression. MATHEMATICS MODE: Example Key in operation Display (-2.5)2 (-2.
Example: 23 + 7 A (30 store into A), calculate 2 sinA and clear memory A. MATHEMATICS MODE: Example 23 + 7 Key in operation A Display 23+7 A 30 2 x sin A = 1 2sin(A Clear memory 0 1 A 0 Independent Memory • Independent memory uses the same memory area as variable M. It is convenient for calculating cumulative totals by pressing (add to memory) or (subtract from memory). • Memory contents are retained even when the calculator is powered off.
Fraction Calculations The calculator supports Fraction calculation and the conversions between Fraction, Decimal point, Mixed fraction and Improper fraction. • Specify the fraction calculation result display format by selecting either mixed fraction ( ) or improper fraction ( ) in set-up menu. • At the default setting, fractions are displayed as improper fractions ( ). • Mixed Fraction display results are only available after selecting ( ) in the setup menu.
Display Values Exchange In Maths mode, press to change the calculation result value between fraction form Decimal form, form Decimal form, √ form Decimal form. In Line mode, press to ONLY change the calculation result value between fraction form Decimal form, the other and √ calculation will display the decimal value only. LINE MODE: Example Key in operation Display 2_|3+2 8_|3 2_|3+2 2.666666667 MATHEMATICS MODE: Example Key in operation Display 2 +2 3 2 +2 3 8 3 2.666666667 3 3 =0.5773502692 0.
Percentage Calculations MATHEMATICS MODE: Example Key in operation Display To calculate 25% of 820 820x25% The percentage of 750 against 1250 750÷1250% 205 60 Degree-Minutes-Seconds Calculations Use the degrees (hours), minutes and seconds key to perform a sexagesimal (base-60 notational system) calculation or convert the sexagesimal value into decimal value. Degree-Minutes-Seconds Decimal points MATHEMATICS MODE: Example Key in operation Display 86º37’34.2” ÷ 0.7 = 123º45’6” 86º37 º 34.
Replay & Multi-statements Replay Memory Function • Replay memory is only available in COMP mode. • After the calculation is executed, the calculation input and result will be stored in the replay memory automatically. • Pressing (or ) can replay the performed calculation input and result history. • After obtaining the calculation result on the display, press or to edit the input expression of that result.
Constant Value Calculations F-789SGA has total of 79 built-in constant values, you can enter (or exit) the constant value selection menu by pressing , the following display will be shown: Input 1 79 mp mn me 00 mµ ao • You can go to the next or previous value selection pages by pressing or . • To select a constant value simply press or . The selection cursor will shift left or right to underline a constant symbol and the lower line display will show the value of the underlined constant symbol.
Constant Table NO. Constant Symbol Value 1.672621777x10-27 1.674927351 x10-27 9.10938291x10-31 1.883531475x10-28 0.52917721092x10-10 6.62606957 x10-34 5.05078353 x10-27 927.400968 x10-26 1.054571726 x10-34 7.2973525698x10-3 2.8179403267x10-15 2.4263102389 x10-12 2.675222005 x108 1.32140985623 x10-15 1.3195909068x10-15 10973731.568539 1.660538921 x10-27 1.410606743x10-26 -928.476430x10-26 -0.96623647 x10-26 -4.49044807 x10-26 96485.3365 1.602176565x10-19 6.02214129x1023 1.3806488 x10-23 22.
NO. Constant Symbol Value Unit 5.670373x10-8 8.854187817 x10-12 12.566370614x10-7 2.067833758 x10-15 9.80665 7.7480917346x10-5 376.730313461 273.15 6.67384 x10-11 101325 5.585694713 0.21001941568x10-15 1.616199x10-35 5.39106x10-44 2.17651 x10-8 1.660538921 x10-27 1.602176565x10-19 3.9903127176x10-10 2.8977721 x10-3 543.1020504 x 10-12 4.35974434 x10-18 2.6867805 x1025 12906.4037217 483597.870 x109 25812.8074434 386.15926800x10-15 0.6652458734 x10-28 1.15965218076 x10-3 -2.00231930436153 1.
NO. Constant Symbol Value 11.73444103x10-15 1.867594294x10-15 0.697787 x10-15 0.111056 x10-15 3.16747 x10-27 0.21030891047 x10-15 1.410570499 x10-26 -3.82608545 1.83247179 x108 3.34358348 x10-27 0.433073489 x10-26 5.00641234 x10-27 -1.074553044 x10-26 2.037894659 x108 6.64465675 x10-27 2.675153268 x108 25.694 x10-6 ! Constant values cannot perform rounding. Source: CODATA Internationally 2010 http://physics.nist.
Metric Conversions The calculator has 172 conversion pairs which allows you to convert a number to and from the specified metric units. • Press enter the conversion menu. • There are 8 category pages (distance, area, temperature, capacity, weight, energy, pressure and speed) containing 36 metric symbols, you can press or to change the category selection page. • In a category page, you can shift the selection cursor left or right by pressing or .
• Go back to the calculation mode by pressing within the category selection menu. After the base conversion unit, , or keys will be invalid. • If the converted result overflows, [ERROR] will be shown in the lower display. Press to select the overflow value; the following scenarios are valid: Scenario A - Keep selecting the other conversion value by pressing or . Scenario B - Clear the screen and jump out of the selection by pressing or .
Logarithm, Natural Logarithm, Antilogarithm and Logab MATHEMATICS MODE: Example Key in operation Display e-3 + 101.2 + In3 = 16.99733128 16.99733128 log381 – log1 = 4 4 Angle Unit Conversion The default calculator angle unit setting is “Degree”. Press to enter the setup menu to change the unit to “Radian” or “Gradient”,: Press the corresponding number key , or for the angle unit you need. Then the display will show the D , R , G Indicator accordingly.
Trigonometry Calculations Before using the trigonometric functions (except hyperbolic calculations), select the appropriate angle unit (Deg/Rad/Gra) by pressing . Angle Unit Setting Angle Value Input Deg Units of 15º Rad Multiples of 12 Gra 50 3 1 Multiples of 90º = Input Value Range for form result radians grads Radians = 100 Gradients.
Permutation, Combination, Factorials and Random Number Generation Permutation: Combination: Factorial : Example 10P3 5C 2 Key in operation Display 10P3 = 720 720 5C2 = 10 10 5! 5! = 120 120 Random Number Generation : Generate a random number between 0.000 and 0.999. The display result will be in fraction format in Maths mode. : Generate a random number between two specified positive integers. The entry is divided by “.
Apps (x + 1) =0 720 Apps 20 Maximum Value and Minimum Value Calculation To calculate Maximum value of 3, sin30 and cos30 Apps Max(3, sin(30), C To calculate Minimum value of 3, sin30 and cos30 Apps Min(3, sin(30), C 32
Modulus After Division (Mod) Calculation Apps Mod(23, 5 Apps Mod(-23, 5 Least Common Multiple and Greatest Common Divisor LCM: Calculate the least common multiple among (maximum) three positive integers. GCD: Calculate the greatest common divisor among (maximum) three positive integers.
Prime Factorization • Factor a positive integer of up to 10 digits into prime factors of up to 3 digits. Ptact Number : 0 < X < 99999 99999 (X is integer) • The reminder that cannot be factored will be enclosed in parentheses on the display. Example: 99999 99999 = 32 x 11 x 41 x 271 x (9091) MATHEMATICS MODE: Key in Operation Display 9999999999 32x11x41x271x(9 1777 (1777) NOTE: or • During any calculation operations, pressing or or key will exit the prime factorization result display.
Quotient and Remainder Calculations “Quotient” (Q) is the result in a division problem, “Remainder” (r) is the value remaining in an integer division problem. The calculated quotient value (Q) and remainder (r) will be stored into memory variables “C” and “D”, automatically assigned. In Maths mode, press or to scroll through a long calculation result. In Line mode, the quotient value (Q) and remainder (r) will be shown over 2 lines.
: Convert rectangular coordinates (x, y) to polar coordinates (r, θ); Press for r, or for θ. MATHEMATICS MODE: Example Key in operation Display Pol(1, √3 With rectangular coordinate (x=1, y= √3). Find Polar coordinate (r, θ) at degree mode r=2, θ=60 X 2 Y 60 : Convert polar coordinates (r, θ) to rectangular coordinates (x, y); Press for x, or for y. LINE MODE: Example Key in operation Display Rec(2, 60 X= 1 Y= 1.732050808 With Polar coordinate (r=2, θ=60º).
Complex Number Calculations Abs Complex numbers can be expressed in rectangular form (z = a + bi) or polar form (r ). Where " a " is the real number, " bi " is the imaginary number (and i is the imaginary unit equal to the square root of –1, -1), " r " is the absolute value, and " " is the argument of the complex number. Imaginary axis ( i ) 4 r 0 Press Press Apps 3 Real axis to enter CPLX mode. to select the calculation type.
Absolute Value and Argument Calculation With the rectangular form complex number, you can calculate the corresponding absolute value (r) or argument ( ) by pressing Abs or Apps respectively. LINE MODE: Example Absolute value (r) and argument ( ) if complex number is 6+8 Key in operation Display Abs (6+8 ) Abs 10 Apps Arg (6+8 ) 53.13010235 Conjugate of a Complex Number If the complex number is z = a + bi, the conjugate value of this complex number should be z = a – bi.
Base-n Calculations and Logical Calculations Press MODE to enter Base-n mode. Decimal (base 10), hexadecimal (base 16), binary (base 2), octal (base 8), or logical calculations. To select a specific number system in base mode, simply press Decimal [DEC], Hexadecimal [HEX], Binary [BIN] or Octal [OCT]. Apps Press key to perform logical calculations including: Logic connection [and] / [or], exclusive or [Xor], exclusive nor [Xnor], argument complement [Not] and negation [Neg].
Logical Operation MATHEMATICS MODE: Example Key in operation 789ABC Xnor 147258 Apps Apps Ans or 789ABC Display 789ABC nor147258 HEX FF93171B Ansor789ABC HEX FFFB9FBF Neg 789ABC Apps Neg(789ABC HEX FF876544 Statistical Calculations Press to enter Statistical calculation mode: the “STAT” indicator will light up. Press Apps (Type) to select the calculation type.
Statistical Data Input After confirming the calculation type in the Statistical Type Apps Selection screen or by pressing (Data) in the STAT mode, the following Statistical Data Input screen will be shown: 1-variable STAT 2-variable STAT 1-variable STAT ”FREQ ON” • After turning on Data Frequency in the setup menu, the “FREQ” column will be added into the above screen. • The following are the maximum number of lines for data input.
Statistical Calculation Screen After inputting the STAT Data, press to enter the Statistical Calculation screen. Statistical Calculation screen is in Line mode for input & output display Use the Statistical Menu to calculate the Statistical result. (S-SUM, S-VAR, S-PTS, Reg). Statistical Menu In the Statistical Data Input screen or Statistical Apps Calculation screen, press to display the Statistical Menu screen.
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Statistical Calculation Example SD Type Statistical Calculation Example: To calculate ∑x2, ∑x, n, x, x n, x n-1, minX, maxX of data: 75, 85, 90, 77, 79 in SD mode (Freq: OFF) Key in operation Display (SD) Apps ∑x2 Apps ∑x Apps n Apps x Apps x n Apps x n-1 33120 406 5 81.2 5.528109984 6.
Please use regression to estimate the effectiveness (estimate the value of y) if the advertisement expenses X=30, also estimate the advertisement expenses level (estimate the value of X1, X2) if the effectiveness is y = 50. Key in operation Display (Quad) Apps 30y Apps 50x1 Apps 50x2 48.69615715 31.30538226 -167.
Press Press to display the distribution calculations screen. Apps , 1: P( 2: Q( 3: R( 4: , or for the corresponding calculations. P(t): Probability below a given point x P(t) 1 P(t)= Q(t): Probability below a given point x and above the mean t 2 e – 1 t–u 2 ( ) 2 dt , Q(t) Q ( t ) = 0.5 – R ( t ), R(t): Probability above a given point x R(t) R ( t ) = 1 – P ( t ), Example: Calculate the probability distribution P(t) for the sample data: 20, 43, 26, 46, 20, 43, when x = 26.
Equation Calculations Press to enter the equation mode; press for next / previous pages.
Example: Solve the simultaneous equation with three unknowns: 2x + 4y – 4z = 20 2x – 2y + 4z = 8 5x – 2y – 2z = 20 Key in operation Display (3 unknowns) X= 11 2 Y= 3 Z= 3 4 48
Quadratic, Cubic and Quart Equations Quadratic equation : ax2 + bx + c = 0 (a second-order polynomial equation with a single variable x) Cubic equation : ax3 + bx2 + cx + d = 0 (an equation with cubic polynomial) Quart equation : ax4 + bx3 + cx2 + dx + e = 0 Example: Solve the Cubic equation 5x3 + 2x2 – 2x + 1 = 0 Key in operation Display (Cubic equation) X1= X 2= X 3= -1 3 +0.331662479 10 3 -0.331662479 10 For quadratic, cubic or quart equations, the variable name starts with “X1”.
Radius is 5cm, cone height is 20cm, calculate the cone volume. LINE MODE: Key in operation Display 0 (COMP MODE) X=(1_|3) B2C 0 B? 0 (radius is B=5cm) C? 0 (height is C=2cm) Solve for X 0 X=(1_|3) B2C (Calculate with new variables) X= L -R = 523.5987756 0 ! If the expression does not include the equal sign ( = ) when Solve calculation is performed, the calculator will transform the solution as zero ( 0 ). ! Solve function cannot be solved an equation.
Example: For the equation Y = 5x2 –2x +1, calculate the value of Y if x = 5 or x = 7. LINE MODE: Key in operation Display (COMP MODE) 0 Y=5X2–X+1 0 Y=5X2–X+1 116 Y=5X2–X+1 232 ! The stored expression will be cleared when you start a new calculation, change into another mode, or turn off the calculator. Differential Calculations Press to enter COMP mode.
! You can leave out the x in the differential expression and the calculator will automatically substitute a value for x. ! The smaller the entered value x is, the the longer the calculation time will be with more accurate results, the larger the entered value x is, the shorter the calculation time will be with comparatively less accurate results. ! Discontinuous points and extreme changes in the value of x can cause inaccurate results or errors.
! When performing integration calculations with trigonometric functions, select radian (Rad) as the angle unit setting. ! Logab, i~Rand, Rec ( and Pol ( functions can not join to integration calculations. Matrix Calculations Press to enter Matrix mode. Before starting matrix calculations, you have to create one matrix or a maximum of four matrices named A, B, C and D at one time. The matrix dimension can be up to 4x4. The matrix calculation results are stored into the MatAns memory automatically.
Editing Matrix Data Apps Press (Data), then specify the matrix A, B, C or D for editing and the corresponding matrix element indicator will be displayed. Input the new value and press to confirm the edit. Press to exit the matrix editing screen. Matrix Addition, Subtraction and Multiplication 1 2 3 9 8 7 Example: MatA = 4 5 6 , MatB = 6 5 4 , MatA x MatB=? 7 8 9 3 2 1 Key in operation Display Apps Apps Apps ! Matrices which will be added, subtracted or multiplied must be the same size.
Obtain the Scalar Product of a Matrix Each position in the matrix is multiplied by a single value, resulting in a matrix of the same size. 3 -2 6 -4 Example: Multiple Matrix C = by 2 -1 5 -2 10 Key in operation Display Apps Apps Obtain the Determinant of a Matrix 10 -5 3 Example: Obtain the determinant of Matrix C = - 4 9 2 1 7 -3 Key in operation Display Apps Apps Apps ! An error occurs if you obtain the determinant of a non-square matrix.
Transpose a Matrix Example: Transpose Matrix B = 9 5 6 2 8 4 Key in operation 5 2 4 Display Apps Apps Apps Identity of Matrix Example: Identity Matrix D 1 0 0 1 Key in operation Display Apps 56
Adjoint of Matrix Example: Adjoint Matrix A 2 4 3 5 < Result: Key in operation 5 -3 -4 2 Display Apps Apps Apps Invert a Matrix 8 3 0.142857142 0.
Determine the Absolute Value of a Matrix Example: To determine the absolute value of the inverted Matrix C in the previous example. Key in operation Display Abs Apps Vector Calculations Press to enter Vector mode. Before starting vector calculations, you have to create one or more vectors named A, B, C and D (maximum four vectors at one time). The vector calculation results are stored into VctAns memory automatically. You can use the vector VctAns memory for any subsequent vector calculations.
Editing Vector Elements Apps Press (data), then specify the matrix A, B, C or D for editing, and the corresponding vector element indicator will be displayed. Input the new value and press to confirm the edit. Press to exit the vector editing screen. Vector Addition and Subtraction Example: Vector A = (9,5), Vector B = (7,3), Vector A – Vector B =? Key in operation Display Apps Apps Apps ! An error occurs if you try to add or subtract vectors whose dimensions are different from each other.
Obtain the Scalar Product of a Vector Each position in the vector is multiplied by a single value, resulting in a vector of the same size. s x VctA(a,b) = VctB(axs, bxs) Example: To Multiply Vector C = (4,5,-6) by 5 Key in operation Display Apps Apps Calculate the Inner Product of Two Vectors Example: Calculate the inner product of Vector A and Vector B. As Vector A = (4,5,-6) and Vector B = (-7,8,9).
Calculate the Outer Product of Two Vectors Example: Calculate the outer product of Vector A and Vector B. As Vector A = (4,5,-6) and Vector B = (-7,8,9). Key in operation Display Apps Apps Apps Apps ! An error occurs if you try to obtain an inner or outer product of two vectors whose dimensions are different from each other. Determine the Absolute Value of a Vector Example: Determine the absolute value of the Vector C. When Vector C = (4,5,-6) and is already created in the calculator.
Example : Based on Vector A=(-1, 0, 1) and Vector B=(1, 2, 0), determine the size of the angle (angle unit: Deg) and a unit 1 vector perpendicular to both A and B. , whereas = cos -1 cos = Unit 1 vector perpendicular to both A and B= < Result: =(0.666666666, -0.333333333, 0.
Function (x, y) Table Calculation Input f(x) function to generate the function table for x & f(x). Steps to generate a Number Table 1. Press to enter the Table function calculation. 2. Function Input screen • Input function with X variable ( ) to generate the Function Table Result. • All other variables (A, B, C, D, Y) and independent memory (M) act as the value. d • Pol, Rec, Q…r, S, dx functions can not be used in the Function Input screen. • The Function Table Calculation will change X-variable. 3.
Battery Replacement Replace the battery immediately when the display characters are dim even with a darker LCD display contrast OR when the following message appears on the screen. Turn the calculator off and replace the lithium battery immediately. ! Low Battery Please replace the lithium battery with the following procedures, 1. Press to power off the calculator. 2. Remove the screw that securely fixes the battery cover in place. 3. Remove battery cover. 4.
Battery Caution! • Keep the battery out of the reach of children. If the battery is swallowed, contact a doctor immediately. • Misuse of the battery may cause leakage, explosion, damages, or personal injury. • Do not recharge or disassemble the battery, it could cause a short circuit. • Never expose the battery to high temperatures, direct heat, or dispose by incineration. • Never leave a dead battery in the calculator as the dead battery may leak and cause damage to the calculator.
