Group 121R battery: equivalents & cars that use it

A BCI Group 121R battery measures 207×175×175 mm (L×W×H). The closest equivalents that fit the same tray are Group 151R - always confirm terminal side and CCA before swapping.

Cross-checked dataEvery spec is checked against manufacturer, retailer, and the BCI group-size standard, then dated.

Compiled and reviewed by the GarageDex editorial team - see how we verify →

What to look for in a Group 121R battery

Case size (L×W×H)	207×175×175 mm
Typical CCA	400-500 CCA (aim for 400+)
Chemistry	Standard flooded
Vehicles using it	12 across 2 makes (2011-2019)

Computed across the 12 Group 121R vehicle-years in our verified dataset - a large sample of popular US models, not the entire fleet.

Buying a Group 121R battery

Match the group size (Group 121R) and aim for at least 400 CCA - more in cold climates. Confirm your own car's rating on its page below; some trims require AGM. A battery is heavy to ship, so buying in person can win once you count free install and the core-charge refund - but to compare prices and reviews:

Best exact-fit replacementGroup 121R, 400+ CCAShop Group 121R Best for cold climatesGroup 121R, at or above 500 CCAShop Group 121R Best AGM upgrade (longer life)AGM Group 121R for heat and heavy loadsShop Group 121R

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Group 121R equivalent sizes

These BCI groups share a near-identical case, so they may fit the same battery tray. “Same terminals” means the +/- posts sit on the same side; reversed terminals (R groups) can leave your cables short.

Group	Case (mm)	Terminals
Group 151R	207×174×175	same

Comparing two specific sizes? Use the battery cross-reference tool →

Cars that use a Group 121R battery

These vehicles are fitted with a Group 121R from the factory:

2013 Hyundai Accent400-500 CCA 2012 Hyundai Accent400-500 CCA 2011 Hyundai Accent400-500 CCA 2019 Kia Soul400-500 CCA 2018 Kia Soul400-500 CCA 2017 Kia Soul400-500 CCA 2016 Kia Soul400-500 CCA 2015 Kia Soul400-500 CCA 2014 Kia Soul400-500 CCA 2013 Kia Soul400-500 CCA 2012 Kia Soul400-500 CCA 2011 Kia Soul400-500 CCA

Frequently asked

How many CCA does a Group 121R battery need?

Group 121R vehicles in our data ship with 400-500 CCA (typically around 400). Match your car's original rating or go higher - aim for the top of that range in cold climates.

Is a Group 121R battery AGM or flooded?

Group 121R is used with standard flooded batteries. AGM is an optional upgrade for longer life in heat and heavy electrical loads, and is safe to fit.

What size is a Group 121R battery?

A BCI Group 121R case measures 207×175×175 mm (L×W×H). Any Group 121R battery uses that footprint, so it drops into the same tray.

What is equivalent to a Group 121R battery?

The closest BCI sizes that fit the same tray are Group 151R. Always confirm the terminal side and CCA before swapping - a reversed-terminal group can leave your cables short.