How To Replace Calculator Battery | Casio Scientific Calculator Battery Replacement Step by Step

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LR44 battery equivalents are also referred to as A76, AG13, L1154, LR1154, 157. These sizes are possible LR44 battery replacements. There are other batteries that are similar to the LR44 battery but are different in composition chemistry.

AG13/LR44/SR44/SR44SW/357 button/coin cell batteries are very popular batteries, commonly found in wrist watches, small flashlights, calculators, some remote control devices, thermometers, laser pointers, and other small electronic units.

According to the IEC standard, this battery should be called LR1154 (alkaline) or SR1154 (silver-oxide). Sometimes shorter, two-digit code is used: LR44 for alkaline and SR44 (or SR44SW) for silver-oxide batteries.

Many manufacturers use their own names for these batteries, but they also tend to add IEC and other standard codes, including short descriptions about the chemistry and other important features.


LR44/LR1154 (alkaline) or SR44/SR1154 (silver-oxide) batteries are button/coin cell batteries 11.6 mm in diameter and 5.4 mm in height. Their capacity depends on the used chemistry, but also on the cut-off voltage of the used device.

Few notes:

AG13 vs SG13: AG13 should be 'alkaline G13' and SG13 should be 'silver-oxide G13' battery. However, sometimes manufacturers mark silver-oxide batteries with both SG13 (correct) and AG13 (not so correct) to emphasize that their battery is a replacement for AG13/LR44/LR1154 battery.

if the battery code starts with the 'L', then it is most probably an alkaline coin cell.

if the battery code starts with the 'S', then it is a silver oxide coin cell.

if the battery code starts with the 'P', then it is a zinc-air coin cell.

if the battery code starts with the 'M' or 'N', then it is a mercury-oxide coin cell. However, due to the presence of mercury, these batteries are no longer in use.

if the battery code after the digits contains 'P', then it is the battery with potassium hydroxide electrolyte.

if the battery code after the digits contains 'S', then it is the battery with sodium hydroxide electrolyte.


Casio Calculator Model Series:

fx-CG20
fx-4500PA
fx-FD10 Pro
fx-992s
fx-991ES
fx-9860G Slim
fx-9860G SD
fx-9860G
fx-9750GA PLUS
fx-9750G PLUS
fx-901
fx-85ES
fx-82MS-BU
fx-82ES PLUS WE
fx-82ES
fx-820MS
fx-7400G PLUS
fx-65
fx-570VN PLUS
fx-570ES
fx-50FH
fx-50F PLUS
fx-50F
fx-500VN PLUS
fx-500ES
fx-3950P
fx-3650P
fx-350ES
fx-115MS
ClassPad 330 PLUS
ClassPad 330
CFX-9850GC PLUS ALGEBRA
FX 2.0 PLUS

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