Forum Discussion

Explorer III

Mar 04, 2014

AGM and Flooded battery combination

I recently bought a boat that has a regular 12 v battery for the 90 hp outboard eng and a Optima 12 v AGM to run a few lights. I would like to put them in the same area and combine them for recharging. Is this possible? or is the chemistry so different to not allow this?

14 Replies

time2roll
Nomad
Mar 04, 2014
They will work OK together when charging from the alternator or in use. Storage without float they need to be separated due to different resting voltage. Best to charge them separately after the day of boating. If spending money get matching batteries.

And yes I have used Optima AGM and Interstate wet cell batteries in parallel.
NinerBikes
Explorer
Mar 04, 2014
Not a good idea, 2 completely different charging profiles.
2oldman
Explorer II
Mar 04, 2014
Mix AGM and acid 2013
WoodGlue
Explorer
Mar 04, 2014
Apples and oranges!

Stick to the 12v AGM and buy another one and you'll be fine!

WoodGlue