Gel Cell Battery

Clean up the label and post the actual battery model and brand etc. for best answers.

How does your house battery stay charged? Are you plugged in or solar? Very easy to pass some of this power to the chassis battery.

Depending on the battery and trickle charge it could take a week to charge. Then it is hard to tell if the battery will charge at all. Best to have a 10 to 40 amp charger.

I very seriously doubt that it is a gel Cell.
Optima are NOT gel cells (though they false advertise they are)

What Optimas are is AGM..

Your starting battery is likely either Maintenance Free wet cell (Valve Regulated Lead Acid) or AGM (Also Valve Regulated Lead Acid, however with the addition of Starved Electrolytic)

There is a lot of things about two (GEL and AGM) that are alike, they both are VLRA, they both can be mounted in odd configurations (On end, side, angle or puside down) They are both able to co-exist with some electronics

But where as AGM's are one of the best, GEL is about the worst for RV or ENgine use. You need to be very very very careful charging a GEL, AGM's are able to accept a much faster charge.

GEL's are very hard to find in Automotive/RV sizes... Last device I had that used GEL was purachased in about 1970. Last Gell cell I purchased about 8 years later.

Thanks guy's I'll slow charge it all day tomorrow.

i've never seen Gel batteries in an RV
are you sure you don't mean AGM

and Optima is a spiral wound AGM

Absorbed Glass Matt aka AGM is different from Gel
both are sealed, but gel requires special charging

I've had Optima gel cell batteries for years. They take a long time to fully charge and like to be charged at a low current rate. Whenever I have a dead one, I charge it for 24 hours or more at trickle rate and that fully charges it, without overheating it during charging.