Grab the spare battery- might not fit into your battery box but who cares. Hook up your battery cables to that battery, exactly how they are now. If you have the same symptoms, then the battery is not your problem. If it seems fine, replace your battery. Once the engine is started, the alternator should be able to hold the load just fine- but a weak battery will at least draw down the battery, trim takes a lot of juice. Good idea having the jump pack on board!
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