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John Gangl's avatar

Here's a twist, I have a diesel truck that I use to pull my 5th wheel in the summer. But in the off-season I have it parked. It has two 12 volt Group 78 batteries with 62 amp hours, 800 cold cranking amps and 1000 cranking amps. I have been using one 2 amp maintenance charger on the batteries to keep them charged over the winter, and it can get to -35 to -38 here at times. So is 2 amp charger big enough or should I be using something larger?

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