Like anything else relying on a battery, you car key fob can die—often at the worst time. Thankfully, these batteries are easy to replace.

A key fob with remote locking/unlocking and push-button start. A key fob with push-button start and keyless entry that owners can leave in their purse or pocket for virtually all functions.

Of course, all hope is not lost because this usually just means the battery in your key fob has died and needs to be replaced. And there's no need for a trip to the dealership to do it as it’s ...