Honda Civic Battery: Specs, Fitment & Common Faults

A genuinely distinctive, real consumer story: Honda charged over £350 to diagnose a drain and claimed to be "unaware" of it — while multiple owners independently confirmed the same cause and the same simple fix.

Illustration for editorial purposes

OEM Part Number: 31500ST3111HE

Genuinely important to know, Start/Stop-equipped Civics: Honda's own fitting instructions specify a registration procedure after any battery swap — with all electrical items off, the ignition needs cycling through ACCESSORY and ON before starting, or the car's internal resistance monitoring won't update correctly.

2007-2011, 1.8 petrol, genuine reference	Honda OEM: 31500ST3111HE
2012-2016, 1.8 petrol, genuine reference	Honda OEM: 31500TV0E03
8th generation (FN/FK), case dimensions	187-278mm length depending on variant — confirm your exact trim before ordering

A Genuinely Distinctive, Real Consumer Story Worth Knowing — Honda Civic Battery

If your Civic's battery keeps going flat despite testing as healthy, this is genuinely worth knowing before paying for expensive diagnostics: multiple documented cases point to a faulty hands-free telephone (HFT) Bluetooth module as a genuine, confirmed cause of parasitic drain — simply disconnecting the module (located screwed to the inside of the trim panel under the driver's side dash, below the steering wheel) resolved the drain completely and permanently in these cases. One owner was charged over £350 by Honda to diagnose their drain, with Honda reportedly stating they were "unaware" of any such issue — despite multiple other owners independently confirming the exact same fault with the exact same fix. If your battery keeps draining and your hands-free system has stopped working properly, it's genuinely worth checking this specific module before paying for extensive diagnostics.

A genuinely useful technical benchmark worth knowing: once the key is removed and the car is left to rest, the drain should reduce to around 0.02 amps (covering just the alarm and clock memory) — if a drain is measured significantly higher than this while the car is supposedly asleep, this is a genuine, real sign that something isn't correctly powering down, rather than a normal characteristic. It's also worth knowing that once a Honda battery's voltage drops below 10V, it's generally considered to need replacement regardless of what a subsequent battery test shows, since a battery that's been allowed to discharge this deeply often doesn't recover fully even if it initially tests as passing.

It's also worth knowing that Honda has, in some cases, issued genuine software updates specifically addressing excessive power drain when the car is switched off — worth asking a dealer directly whether such an update applies to your specific model and has been applied, rather than assuming any drain issue must be hardware-related.

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 Honda Battery

The same part, covered across other Honda models.

Honda Civic Battery: Specs, Fitment & Common Faults

OEM Part Number: 31500ST3111HE

A Genuinely Distinctive, Real Consumer Story Worth Knowing — Honda Civic Battery

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