2016–2021 Honda Civic Battery Size (BCI Group and CCA)

Which Honda Civic model years does this cover?

These battery specifications apply to every Honda Civic built from 2016 through 2021 — the 10th generation (FC/FK), compact sedan, coupe, and hatchback. Nothing in this specification changes between those model years. Pick your year for the engines it offered, what changed that year, and the problems recorded against it.

What changed during the 2016–2021 Honda Civic

• 2016Generation launch (sedan/coupe, 2.0L and 1.5T). Two recalls hit the first year: piston pin snap rings (16V-074) and the electric parking brake software (16V-725).
• 2017Hatchback, Si (205 hp), and Type R (306 hp) join the lineup
• 2019Facelift: revised fascias, standard Honda Sensing, volume knob returns, new Sport sedan/coupe trim
• 2021Final year; sedan/hatch only (coupe dropped after 2020, no 2021 Si)

What size battery does a 2016–2021 Honda Civic take?

BCI group 51R, rated at 410 cold cranking amps from the factory. Group size is a physical dimension and terminal-position standard, so a battery from a different group may not clamp down or may put the terminals on the wrong side.

How many CCA does a 2016–2021 Honda Civic need?

At least 410 CCA. Going higher is harmless and helps in cold climates; going lower is how a vehicle that started fine in October stops starting in January.

Does the 2016–2021 Honda Civic need an AGM battery?

The factory battery is a conventional flooded type. AGM is a valid upgrade, but never downgrade from AGM to flooded.

Where is the battery on a 2016–2021 Honda Civic?

Engine bay, driver side.

Does a 2016–2021 Honda Civic need the battery registered after replacement?

All 10th-gen Civics. 2.0L, 1.5T, Si, and Type R, use a Group 51R battery (factory ~410 CCA; common replacements 425–500 CCA). No start-stop system, so a flooded battery is fine; keep the hold-down bracket, the 51R is small and tips easily.