CHOOSING A CAR BATTERY
This guide is general information, not a substitute for your owner’s manual or a qualified technician. Always confirm specs and fitment for your exact vehicle.
1. Match the group size
The BCI group size (for example Group 24F, 35, 48 or 65) sets the battery’s physical dimensions and terminal layout. A battery with the wrong group may not fit the tray or hold-down, or the cables may not reach. Find the group on your current battery’s label, in your owner’s manual, or in a fitment lookup. Some vehicles are listed with more than one acceptable group.
2. Meet or exceed the CCA rating
Cold cranking amps (CCA) measure how much current a battery can deliver for starting in cold weather. Choose a battery that meets or exceeds the CCA your manufacturer specifies; this matters most in cold climates. More CCA than specified does not harm the car.
3. Check the battery type
Many newer vehicles, especially those with engine start-stop systems, come with an AGM (absorbent glass mat) or EFB battery. If your car came with AGM, replace it with AGM. Some vehicles also need the battery “registered” with the car’s computer after replacement; check your manual or ask a shop.
4. Look at reserve capacity and warranty
Reserve capacity indicates how long a battery can run essential loads if the charging system fails. Warranty terms vary by brand and type, so compare the free-replacement period, not just the total length.
Signs it may be time
- Slow cranking, especially on cold mornings
- A battery warning light or electrical glitches
- Corrosion on terminals or a swollen case
Many auto parts stores will test a battery for free. Old batteries contain lead and acid and should be recycled; retailers that sell batteries typically accept them.
In AutoForge
AutoForge lists OEM and aftermarket batteries with the group size and CCA from manufacturer catalogs and spec charts, linked to the source. Always confirm fitment for your exact vehicle and engine.