Most cheap little round laser pointers such as from a dollar store use the SR41 or LR41 1.5v button battery (x3), this battery is 7.9mm x 3.6mm and also has other names. Below is our link to these batteries and other names for these batteries. Please verify this is the correct battery before ordering as these may vary.
SR41 / LR41 Batteries:
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Battery Differences
SR41
These are Silver Oxide chemistry, typically a little more expensive but provide a better discharge characteristic.
LR41
These are Alkaline Manganese chemistry, typically slightly lower price but only provide an average discharge characteristic.
All Batteries:
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Other Battery Names
LR41
LR41 (192)
SR41
392-384TZ
392/384
392
384
SR736SW (SR41)
SR41SW-5SE
SR41W-5SE
SR41W
SR41SW
AZ312DP-8
N100-ND
490-18189-ND
490-SR41-ND
728-1114-ND
728-1101-ND
2984-TOSHIBALR41-ND
2984-TOSHIBALR41(TS-1)-ND
2984-MAXELLLR41(TS-1)-ND
2984-LR41(192)-ND
2984-SR736SW(SR41)-ND
SR41SW-5SE-ND
SR41W-5SE-ND
2984-LR41-ND