12volt 12 amp battery charger?

In a ideal world your 12 amp charger would put in 12 amps per hour and if the battery were 60 amps low it would charge in 5 hours. But we don't live there.

It all depends on how much draw down you have had, the water level of the battery, and when your charger kicks down in output. It might be anywhere from 3-15 hours.

Cool then all is well Thanks, It is a gel battery.

might want to get a 20 amp charger

get yourself a charger with a gel battery setting -- they don't do so well on a wet cell charging algorithm.

Thanks for the info do have a gel battery charger. Is this a better battery?

big perk of gel cells is no spills. My only experience with them was a few years ago and the one I had didn't last as many cycles as my traditional trolling motor battery so i went back to the regular deep cycle batteries. gel cells are very handy when you pull the battery from the boat frequently like on a jon boat or one of those mini bass boats.

Forgot to mention I charge my batteries at 10amps and use a 125amp hour trolling battery and it takes about 16 hours to charge after a hard days use which doesn't seem to add up but got to remember battery chargers are not 100% efficient so a 10amp charger may only have an effective charging rate of 7-8amps at the battery.

my trolling motor batteries, 2 interstate marine DC, with 5A each take roughly 24-36 hours to fully charge after an all day trip.

Thanks.