Batteryminder Plus Charger/Maintainer/Desulfator

Full-time battery monitoring automatically tests battery every microsecond, supplying only the current needed to maintain battery at full charge
2-stage unit charges and maintains from 1 to 4 batteries at a time (12V batteries parallel-connected or 6V batteries series-connected. NOTE: Never connect 2 or more batteries together in parallel before fully charging each and checking their condition. Failure to fully charge each battery and check their condition can result in a serious safety hazard)
Does not overcharge, regardless of time connected
High-frequency pulses safely remove sulfate from battery's plates that prevent the batteries from holding a full charge
No need to add water to maintenance-type batteries during long, non-use storage