Hi Mick. I’m a first-time writer but a longtime reader. I have removed my four AGM batteries from the boat and placed them in my basement. How do I properly care for them over the winter? If the answer is some sort of charging, please advise what product(s) you would recommend. Thanks.
Dick Buttrick Cataumet, Massachusetts
Hi Dick. Batteries should be stored fully charged. I like to charge them, then remove the charger and check the batteries monthly. If they have discharged significantly, I will then recharge them. AGM batteries self-discharge at a much slower rate than standard floodedcell batteries. Still, if you cannot monitor the batteries monthly, I suggest using a float charger, often called a trickle charger or battery maintainer. A float charge is a small controlled amount of current. In all cases, you want to check the battery-maker’s specifications with respect to maximum amperage and voltage ranges. Then select and use a charger that meets those requirements.