ProMariner has a new fully automatic, electronic three-step marine battery charger ($229-$449). The 12-, 24- or 36-volt waterproof ProTournament is pre-wired for easy installation, and will charge batteries onboard to 100 percent at a rate of two to three times faster than ordinary chargers, according to the company. An optional remote temperature sensor, remote battery bank status monitor and AC plug holder are also available.