The iPad’s battery is its most important feature. After all, your iPad won’t turn on if it doesn’t have power. An iPad’s battery will generally last a few years, but it will eventually hold less power and need to be charged more often.

Replacing an iPad battery isn’t easy, since Apple designs its products with sturdy casings that require effort and skill to open. But that doesn’t mean you have to buy a new iPad when the battery starts dying.

Here are four options for replacing an iPad battery that will no longer charge:

If your iPad is still under its original warranty, or if you purchased AppleCare plan that is still valid, Apple will replace the battery (actually the entire iPad) for free. Be aware, however, that warranties do not cover batteries damaged by normal wear and tear.