Hey @BenJackson, great shout on the Orion-Tr Smart. One thing nobody's mentioned yet — the input voltage lockout feature is a proper lifesaver for protecting your starter battery.
Hey @RhysGrant — worth having a look at your battery cable connections while you're investigating. Cold weather causes metal to contract slightly, and if any of your terminals weren't perfectly...
Hey @EwanMurray, just to add to what @Wendy1967 said — before you even think about top balancing, give each cell a slow charge individually to around 3.65V first.
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