I was wondering if these are suitable for AGM and found this .
The official GM/CTEK documentation for the US 3300 (model 1051) lists “Type of batteries: All types of lead‑acid batteries (WET, MF, AGM, Ca/Ca)”.
It’s a 4‑step fully automatic switch‑mode charger with pulse maintenance, which is the same CTEK MULTI US 3300 platform known to support AGM when set to the appropriate mode/voltage.
Corvette‑forum users with AGM batteries (including ZR1s) reference the same manual stating AGM compatibility and note that proper AGM charging requires ≤14.4 V, which this unit provides in its normal mode.
The official GM/CTEK documentation for the US 3300 (model 1051) lists “Type of batteries: All types of lead‑acid batteries (WET, MF, AGM, Ca/Ca)”.
It’s a 4‑step fully automatic switch‑mode charger with pulse maintenance, which is the same CTEK MULTI US 3300 platform known to support AGM when set to the appropriate mode/voltage.
Corvette‑forum users with AGM batteries (including ZR1s) reference the same manual stating AGM compatibility and note that proper AGM charging requires ≤14.4 V, which this unit provides in its normal mode.
