Lexus NX Battery: Specs, Fitment & Common Faults
A genuinely important safety point: because this is a hybrid, the 12V battery genuinely cannot be jump-started conventionally — it needs trickle charging, or the hybrid system's circuits risk damage. Plus a confirmed £247 average UK replacement cost.
Illustration for editorial purposes
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OEM Part Number: 28800-AZC09
| NX300h (2014 onwards), genuine reference | Lexus OEM: 28800-AZC09 — L2 type, 60Ah, also shared with related RAV4 Hybrid and Verso models |
|---|---|
| 2015-2021 NX300h, alternative genuine reference | Lexus OEM: 28800-36133 (also referenced as 2880036131, 2880036130, 28800-36131) |
| NX300 (petrol), genuine reference | Lexus OEM: 2880036050 (also referenced as 2880036051, 28800-36050) — BCI Group 47 (H5), AGM, 680 CCA |
Lexus NX Battery: The Part Everyone Blames First, Not Always Correctly
On the Lexus NX, more non-starts get pinned on the battery than on any other single component, and that assumption is correct often enough to justify checking it first. It's not always the real cause, though, so it's worth confirming before spending money on a replacement that doesn't fix the problem.
Lexus NX Battery: What It Does
On the Lexus NX, every engine start and every moment the electrical systems run without the engine turning draws on the 12V battery. Stop-start puts far more demand on that battery than older designs, given how often the engine cycles off and on — hence the need for an AGM or EFB battery instead of a standard type.
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A Genuinely Important Safety Point Worth Knowing About This Hybrid — Lexus NX Battery
This is genuinely important to understand before attempting to jump-start a flat battery: because this is a hybrid, the small 12V auxiliary battery genuinely cannot be jump-started in the conventional way. Instead, it needs to be trickle charged specifically, since attempting a standard jump-start risks genuine damage to the hybrid system's circuits.
It's also genuinely worth knowing a specific diagnostic finding if you're chasing a persistent parasitic drain: documented cases describe successfully isolating a drain to specific fuses, eventually traced to a specific multiplex network communication unit — worth having a proper fuse-by-fuse parasitic drain test carried out rather than assuming a battery replacement alone will resolve a recurring drain.
Lexus NX 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 Lexus Battery
The same part, covered across other Lexus models.