The Jazzy batteries sit upright, so wet batteries could be used, but I don't think I will try it.
The batteries took a charge and it appears the charger is working ok. With 26 volts on the gauge I took it out and climbed my neighbors very steep driveway. Voltage dropped to around 22 volts, but it climbed it just fine.
My Jazzy will need new batteries, so I will buy them later. The Rascal is my outside transportation now that it has quit raining 24/7.
My service dog and I use the Rascal quite a bit up at Lake Tahoe. We stay up there Oct & Nov most years (unless medical problems interfere).
She is a 7 year old Portuguese Water Dog who is good for one or two laps around the RV park, then she wants in my lap to ride. She hangs off on both sides, but is thrilled to be next to my wife while she does her laps.
Before we go back up there I will put a pair of new batteries in the Rascal and put these batteries back in the Jazzy.
I have 2 U1 gel battery going on 5 years old. The dealer told me the best way to get long life of the battery, is: when you get off the chair or scooter, plug it in & keep it plugged in until you use it the next time. The on board charger is like a trickle charger.
My btteries are 5 years old in my scooter and are still going strong. They are 2 12V Optimas in series in my Ranger. I sure hope they last a long time because the best price I have seen is $187 each for replacement. They are totally disconnected when the unit is disassembled. As long as I can lift the batteries I can carry the whole thing in my Vue and assemble in about 2 min. I have a range of about 12 miles per charge.
2003 Newmar Mountain Aire, Workhorse W22, 2008 Saturn Vue, Falcon 5250, & US Gear Unified Tow Brake