AG13 batteries are a popular 1.5V button cell battery. They are the most popular alkaline button batteries due to having the highest capacity in their family of batteries.
Capacity: 128 mAh
LR44, L1154, SR44, SG13, LR154, A76, S76, EPX76, 157, 303, 357.
Where to Buy
You can find these button batteries at your local department store. Duracell and Energizer will call them 303 or 357 batteries.