Why The Lithium Battery Has Power But Won't Start The E-Bike? BMS Pre-Charge Is the Fix

Many e-bike owners with lithium batteries have faced a frustrating issue: the battery shows power, but it fails to start the electric bike.

The root cause lies in the e-bike controller's pre-charge capacitor, which demands an instant large current to activate when the battery is connected. As a critical safety safeguard for lithium batteries, the BMS [https://www.dalybms.com/smart-bms/] is engineered to prevent overcurrent, short circuits, and other potential hazards. When the sudden current surge from the controller's capacitor impacts the BMS during connection, the system triggers its short-circuit protection (a core safety function) and temporarily cuts off power - often accompanied by a spark at the wiring. Disconnecting the battery resets the BMS, allowing the battery to resume normal power supply.

Image: https://www.dalybms.com/uploads/175e24918f98a4bfb3940347203e8565.jpgImage: https://www.dalybms.com/uploads/acff99c8fff7ac762c044199d0767463.jpg

How to resolve this? A temporary solution is multiple power-on attempts, as controllers vary in parameters. However, the permanent fix is equipping the lithium battery's BMS [https://www.dalybms.com/smart-bms/] with a pre-charge function. When the BMS detects the sudden current surge from the controller, this function first releases a small, controlled current to power the capacitor gently. It satisfies the startup needs of most controllers on the market while retaining the BMS's ability to block real short circuits effectively.

For e-bike enthusiasts and manufacturers, understanding this safety mechanism is key. A high-quality lithium battery with an advanced pre-charge BMS ensures stable operation without compromising safety, avoiding unexpected power interruptions during use. As lithium batteries gain wider adoption in e-mobility, optimizing BMS functions like pre-charge will remain pivotal to enhancing user experience while upholding safety standards.

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Company Name: DALY BMS
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Country: China
Website: https://www.dalybms.com/

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