Battery Replacement: 2008 Hummer H3 3.7L 5 Cyl.

Where is the battery located in a Hummer H3?

The video above shows you how to replace the battery in your 2008 Hummer H3. We recommend changing the battery in Hummers every 4 years. Although some batteries last much longer, most batteries begin breaking down chemically after four years, so you could experience dimmer headlights and other negative effects before you have a dead battery in your H3 that you need to replace.

The battery location in a Hummer H3 can typically be found in the engine bay, but may be in the trunk, fender or inside of the vehicle. You may need to remove the air filter housing, a plastic engine cover or parts of the cowl to find the battery in your H3. See exactly where the battery is located in your 2008 Hummer H3.

Replacing the battery in your H3 involves removing the terminals. When you reconnect the terminals, your radio presets are likely to be cleared out. In some H3s, you may need to re-enter a security code to get your radio to work again. Check for this code in your owners manual - it will usually be either a sticker or small card in the booklet. If you can't find it, call Hummer and they will give you the code for free. In many Hummers, the transmission "learns" how you drive over time and makes adjustments, so you may experience altered driving dynamics as your car re-learns your driving style after changing the battery.