Do not confuse this battery with the 1/2AA size rechargeable type that are 1.2 volts, the A544 (sometimes referred to as 1/2AA) that are 6 volts or the LR42 "B" cell.
Some lists "cross over" in their data giving either type the same reference number. Below is all the information I can find. You decide which suits your application.
About the Chemistry:
NOTE: These Lithium types are NOT rechargeable, they are single use batteries.
Equivalents (check for application):
1/2AA, 1/2ER6, 1/2R6, 1/2UM3, 3B26, 6ES5-980-0MA11, 60-0576-100, 418-0076, 742-0011, 922-1262, 14250, 1770-XZ, 1770-XZB, 1771-DB, 1772-LW, 1772-LWP, 1772-LX, 1772-LXP, 1772-LZ, 1772-LZP, 6127, 6135-99-770-2535, B, B-2/16, B-2/17, BR1/2AA, BR 1/2 AA, BR 1/2AA, BR1/2 AA, BR-1/2-AA, BR14250, C-2/16, C-2/17, CR1/2AA, CR1/2 AA, CR-1/2-AA, CR 1/2 AA, CR 1/2AA, CR14250, CR14250SE, D-2/16, D-2/17, DL1/2AAL, ECR1/2AA, ER3, ER3S, ER3S-TC, ER3V, ER4, ER14250, ER14250H, ER14250M, ER14250S, ER14252, LS-3, LS3, LS14250, LS-14250, LS1450-BA, LS-14250C, LTC-9C, MINI-PLC-2/02, MINI-PLC-2/16, MINI-PLC-2/17, SL-14250C, SL-150/S, SL-350/S, SL-750/S, T04/41, T04/51, TL-2150, TL-2151, TL-2150/S, TL-4902, TL-5101, TL5101/S, TL-5111, TL-5112, TL5150S, TL-5151, TL5151S, TL-5902, TL-5902/S, VL1/2AA,
not to scale.
Length × Diameter.
|Chemical Composition.||Nominal Voltage.|
|CR1/2AA||25.2 mm × 14.7 mm|
CAUTION: some manufacturers have the "pip" Negative and the flat as Positive (see the Varta, left).
|3 volts (LiMnO2),|
3.6 volts (LiSocl2).