There are plenty of reasons why you would need an extra battery. Whether the one you had burnt out, you lost it, you want longer battery life or simply need an extra - PartStore has the battery you need. Most batteries average 300 to 400 lifetime charges. Battery life is affected by usage amounts. We encourage users to stock up on extras, and of course, to dispose of them properly. We recommend that you follow all environmental guidelines when disposing of your batteries.