Ford C-Max Battery: Specs, Fitment & Common Faults

If your C-Max's stop-start has stopped working, a charging reset is worth trying before assuming the battery itself has failed.

Illustration for editorial purposes

Find Ford C-Max Battery Here!

Opens live listings in a new tab.

OEM Part Number: GM5Z10B759C

Genuinely important to know: C-Max Energi (plug-in hybrid) has a completely separate high-voltage lithium drive battery from the standard 12V starter battery — don't confuse the two. A genuine Ford Owners Club member also directly reported their factory-original 12V battery (43Ah/390A) felt weak for a 2008 facelift 1.6 petrol, upgrading to 60Ah/540A instead.

2013-2018 C-Max (non-Energi), genuine 12V battery reference	Ford OEM: GM5Z10B759C (also referenced as FM5Z10B759K, FM5Z10B759N)
C-Max Energi, high-voltage drive battery (not the 12V starter battery)	Ford OEM: FM5Z10B759QARM — a genuinely separate, much more expensive component
Earlier facelift models (2008), owner-reported factory spec	43Ah/390A — some owners have upgraded to 60Ah/540A or 61Ah/600A for improved cold-start performance

A Stop-Start Warning Doesn't Automatically Mean a New Battery Is Needed

A genuinely common source of confusion across Ford's stop-start range: the system frequently disables itself and displays a warning about charging or cold conditions, and many owners assume this means the battery has failed and needs replacing. In most cases it hasn't — Ford's Battery Management System deliberately disables stop-start when it judges the battery isn't in a strong enough state to reliably restart the engine, which is the system protecting itself rather than malfunctioning. Owner reports consistently show this resolving itself after a full overnight charge on a proper smart charger, without any need to replace a perfectly healthy battery.

A genuine, documented fix worth knowing: many Ford owners report a specific "charging reset procedure" resolving persistent stop-start and low-battery warnings without needing a new battery: with the ignition on (engine off), flash the main beam headlights five times, then press the brake pedal three times, and wait roughly 20 seconds for the battery warning light to flash, confirming the reset. This isn't an official Ford procedure, but it's widely reported across owner forums as genuinely effective — worth trying before assuming your battery needs replacing.

Find Ford C-Max Battery Here!

Opens live listings in a new tab.

Ford C-Max Battery: 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 Ford Battery

The same part, covered across other Ford models.