yes not cheap, find a smart charger [has 3 stage charging, bulk, absorption and float] - lead acid and AGM batteries take 14.2V charge, gel cells need to stay below 13.8 or you shorten their life considerably - if you don't already have the gel cell, skip that and get an AGM

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot