Key takeaways
- Group size must physically fit and match terminal layout.
- CCA rating should meet or exceed the OEM spec.
- AGM cars need AGM replacements — not standard flooded.
- Many modern vehicles need battery registration after install.
Group size and fit
Every battery has a BCI group size (e.g. 24F, 35, 47/H5, 48/H6) that defines physical dimensions and terminal locations. The replacement must match — a battery that's too small can shift or short, and one that's too tall may not clear the hood.
CCA and battery type
Match or exceed the vehicle's OEM Cold Cranking Amps rating. Never downgrade. If your vehicle came with AGM (common on stop-start and many European cars), the replacement must also be AGM — installing standard flooded on an AGM system shortens life dramatically.
Registration and reset
Many post-2010 vehicles require the new battery to be registered to the Battery Energy Management System (BMS) with a scan tool, or the alternator will undercharge the new battery. Our mobile battery techs carry the tools to handle this on the spot.
Frequently asked questions
How long does a mobile battery replacement take?
Most passenger-vehicle installs finish in 20–40 minutes on-site, including testing, install, and any required registration.
Do you warranty the batteries you install?
Yes. Our batteries carry manufacturer warranties, and we stand behind the install itself.