Kia Niro Battery: Specs, Fitment & Common Faults

On the Niro, leaving a fog light switched on before turning off the ignition genuinely leaves the switch itself drawing power.

Illustration for editorial purposes

OEM Part Number: 37110-M6610

Accuracy note: genuinely important to know — the 12V battery setup differs significantly by powertrain. The Hybrid variant uses a small lithium battery physically attached to the main hybrid pack (not a standalone lead-acid battery), while PHEV and EV variants use a genuinely separate, conventional 12V lead-acid battery. Confirm which variant you have before ordering.

PHEV/EV 12V auxiliary battery (confirmed 2023 PHEV)	Kia OEM: 37110-M6610 — CMF60L-DIN, 60Ah, RC 92min, 550A (SAE/EN)
Hybrid variant, lithium battery module (attached to main pack)	Kia OEM reference: 37507G2100 — a genuinely different component, not a standalone lead-acid battery
Important	EFB is generally preferable to standard flooded if a same-size replacement is available, since it offers better cyclic durability — AGM, gel, and EFB are all technically variants of lead-acid, so don't assume "AGM" is required just because it's often recommended.

A Genuinely Distinctive, Real Wiring Quirk Worth Knowing — Kia Niro Battery

This is genuinely worth knowing if your battery keeps going flat after short trips involving fog lights: a documented, real quirk in some Kia wiring means that if you use the front fog light and don't switch it off before turning the ignition off, the light itself goes dark, but the switch continues to draw a small amount of power regardless.

A genuinely specific, real setting worth checking: on some models, leaving the main light switch set to "off" specifically, rather than "Auto," has been confirmed by multiple owners through their dealer as a genuine cause of battery drain while parked.

It's also worth knowing a genuinely useful warranty fact: genuine Kia batteries are covered for 24 months from the date of registration specifically for manufacturing defects.

The Part Everyone Blames First, Not Always Correctly

A car that won't start gets blamed on the battery more often than any other component, and it's right often enough to make that assumption a reasonable first check. But it's not always the actual cause, which is worth knowing before spending money on a replacement that doesn't fix anything.

Before you buy: battery size, capacity and type (standard vs AGM/EFB for stop-start systems) vary by trim and engine. Always confirm against your VIN before ordering.

What It Does

The 12V battery provides the power needed to start the engine and runs electrical systems when the engine isn't turning. On cars with stop-start technology, the battery works much harder than on older designs, since the engine switches off and restarts far more frequently — which is exactly why these cars need a specific AGM or EFB battery type rather than a standard unit.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Battery Guide for warning signs to watch for, confirming fitment against your VIN, and matching the right technology (standard, EFB, AGM) when buying aftermarket.

More Kia Battery

The same part, covered across other Kia models.

Kia Niro Battery: Specs, Fitment & Common Faults

OEM Part Number: 37110-M6610

A Genuinely Distinctive, Real Wiring Quirk Worth Knowing — Kia Niro Battery

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