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What batteries and what is the condition of the batteries? Miles, Type. Have you checked the capacity of the pack? You could have a battery or two that are failing and that could be triggering your low voltage drop out. Batteries are the first thing to check. Check the terminals and the voltages and then the capacity and how they react under heavy load. Likely dead or dying cells. You can have a normal voltage under no load but a big drop under load. Cells sound more likely the trouble. Update us on what you find. Details will help others here diagnose your troubles.