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Why does the new battery lose power when accelerating?

2 Answers

WilliamAnn

07/29/25 8:41pm

Here are the reasons why the new battery loses power when accelerating: 1. High starting current: The current is about three times that of normal driving. The combined resistance of the wiring, internal resistance of the battery, and the controller's field-effect transistors, along with high-current discharge, causes significant voltage fluctuations. 2. Charging duration: Battery self-discharge. Some users do not ride their electric vehicles immediately after fully charging them, leaving the vehicle unused for several days without timely recharging. 3. Damp wiring: If the electric vehicle is frequently used in rainy or snowy weather, damp wiring could also be a possible reason.

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ElijahLee

08/14/25 5:58pm

I just replaced the new battery and noticed the dashboard voltage drops when I step on the accelerator, which is really concerning. The other day when I installed the battery myself, I didn’t notice the oxidation layer on the metal contact surface of the terminals, and the screws weren’t tightened properly, causing the engine vibration during acceleration to make the electrical connection even more unstable. Later, I also found that the alternator belt was worn and slipping, failing to supply enough power when the RPM increased. I recommend first checking the battery terminals for corrosion or looseness yourself, sanding them down, and re-securing them, then inspecting the belt for cracks. If you’re not confident in DIY repairs, it’s safer to take it to a repair shop to test the alternator output and voltage regulator—don’t risk a breakdown on the road affecting your safety.

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