See one user's review from CF in 2017. Check with me in a few years, I just bought 4 of them. I felt they were a good alternative after looking at the cost of switching to lithium batteries
. Inexpesnive? No, with tax & shipping
close to $600/ battery. If they do something close to what they are touted to do the overall $/Ah should come out less than a $400 East Penn or similar.
Re: Any two years reviews for Firefly batteries
2 full seasons on 2 firefly*batteries*in parallel.
So far so good they've been excellent. They charge fast and deliver a good power. When I'm out cruising I do discharge them quite deeply.. so far they don't seem to care that I am beating them up. I should probably equalize them at some point.
The directions come with information about charging
but it's pretty close to a lead acid battery. If you have a*Balmar*style alternator that is externally regulated you may want to check the charge voltage to ensure it complies.
But after two seasons it's taking all I can throw at it, I'm wondering why they even make any other kind of battery!