I play w/ scooters and other electric stuff all the time.
I am very familiar w/ that 12 ah battery, and it is an AGM SLA battery, trust me.Those batteries will charge just fine paralleling them the the RV batteries.
Many of the smaller SLA AGM batteries out there are called Gell, but in reality they are not true Gell as we've learned to know them. A genuine Gell battery would never be used in that kind of a deep cycle service.
The next post show what I use to parallel to my RV house batteries, whether it be my boat battery, or my electric scooter batteries.
