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Hi Beren, I use a CTEK Multi7000 which is a multistage charger designed for many batterytypes, a tad expensive but I have a few different batteries ranging from sealed 115A/Hr in a Solar set up to 4WD, Boat, Car, rideon mower etc. It's auto operation and has well paid for itself I reckon. It can be used as a 12v power supply too and I use it to run peltier coolers in this mode. If you look around the recreational Caravan, Camper trailer, Motor home areas they have excellent chargers available for sealed/GEL cells these days. Like anything you get what you pay for. Batteries must be maintained correctly or they don't last very long. Good luck!
Regards Ian Gillespie
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