Originally Posted by chorscroft
Oh and I forgot to mention that it's a gel type battery. Does this affect what charger you can use?
Is it actually a gel cell battery, or is it an AGM type?
If it is actually an AGM, no worries; they use the same charge system that a regular flooded wet cell (older car battery) uses.
Gel cells, ideally, will use some electronics between the alternator and the battery to keep the charge voltage relatively low (compared to a flooded lead acid or an AGM battery.) A home charger should be configured likewise.
GEL: The Gel Cell is similar to the AGM style because the electrolyte is suspended, but different because technically the AGM battery is still considered to be a wet cell. The electrolyte in a Gel Cell has a silica additive that causes it to set up or stiffen. The recharge voltage on this type of cell is lower than the other styles of lead acid battery. This is probably the most sensitive cell in terms of adverse reactions to over-voltage charging. Gel Batteries are best used in VERY DEEP cycle application and may last a bit longer in hot weather applications. If the incorrect battery charger is used on a Gel Cell battery poor performance and premature failure is certain.
That said, I'm sure there are people using standard chargers for gel batteries. Whatever works for you, but according to the manufacturer's, it's not ideal.