Hello Ashley,
No there isn't a 6V one, unfortuantly.
Hello Clive,
No there isn't a 24V one either, but as normaly 24Volters normaly have two 12V batteries, I use the battery isolater and use a conditioner on each battery.
Hello Jack,
They work differently to a normal charger. Firstly they charge at a much lower rate, lower even than a stardard charger on trickle charge, this stops the battery getting too hot and damaging the plates inside. Secondly, they allow the battery to "drop" a little rather than just keep on charging. So the battery is "cycling" as it would be in a vehicle in normal use.
Batteries need to be "used", letting them go flat, then recharging them, then letting them go flat again tends to break them down.
Many Thanks
Richard