Lexus CT200h 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, especially after a couple of weeks standing unused.
Illustration for editorial purposes
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OEM Part Number: 28800-AZC34
| 2012-2020, 12V auxiliary battery, genuine reference (shared with Prius, Prius+, Auris) | Lexus OEM: 28800-AZC34 (also referenced as 28800-YZZPD) — S46B24R, 35-45Ah |
|---|---|
| Alternative genuine reference | Lexus OEM: 2880021171 (also 28800-21171, 2880021170) |
| Important | Never confuse this with the hybrid drive battery — genuine part G951076012 — which is a completely different, much more expensive component. |
Lexus CT200h Battery: The Part Everyone Blames First, Not Always Correctly
On the Lexus CT200h, the battery takes the blame for most no-start situations, and often rightly so — it's a sensible first check. But it isn't always the genuine cause, which is worth establishing before paying for a new one that turns out not to solve anything.
Lexus CT200h Battery: What It Does
The Lexus CT200h's 12V battery handles engine starts and keeps electrical systems running whenever the engine isn't. On stop-start versions, that job gets much harder, since the engine switches off and restarts constantly — which is why it specifically needs an AGM or EFB battery, not a standard one.
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A Genuinely Important Safety Point Worth Knowing About This Hybrid — Lexus CT200h 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 — worth keeping this in mind given how easily a hybrid battery can go flat after a couple of weeks of standing unused.
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 test carried out rather than assuming a battery replacement alone will resolve a recurring drain.
Lexus CT200h 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.