Buy a CR1632 battery online through sites such as Amazon.com, Walmart.com, RadioShack.com and eBay.com. Check the product listings for the battery to make sure that it is compatible with the specific electronic device you are using.
Walmart and RadioShack offer an in-store pickup service on items sold through their websites, although not every item qualifies for this service. Amazon.com and eBay.com contain listings from third-party sellers, which means the buyer needs to take extra caution when choosing these options to avoid potential fraud or scams. Both sites offer buyer protection programs in the event that the battery purchased does not match the product description or does not contain a charge.