Battery temperature is too high

Stop riding Last verified: pending review Reviewed by: editorial team

Quick answer

Error code 45 indicates that the battery temperature has exceeded safe limits. This condition prevents the motor from functioning to protect the battery from damage. The issue is typically resolved by allowing the battery to cool down.

Stop riding Battery Often DIY-friendly Beginner (15–30 min)

Does this apply to your bike?

H700 · Bafang · Common displays: DP E171

Heads-up: the same number can mean different things on other systems — always check your drive system first. Browse all drive systems →

What you’ll notice

The display shows error code 45, and the motor does not operate.

Likely causes, ranked

Start at #1 — causes are ordered by how often they turn out to be the problem.

#1 Battery overheating

How to check: Inspect the battery for excessive heat; if hot, allow it to cool.

Troubleshooting steps

Cool down the battery

easy

Turn off the system and let the battery cool down before restarting.

If it passes →Check if the error code is cleared.

If it fails →Proceed to replace the battery.
Replace the battery

intermediate

If the error persists after cooling, replace the battery.

If it passes →Confirm the system operates normally.

If it fails →Contact Bafang for further assistance.

When to stop and get professional help

If the battery continues to overheat after replacement, consult a professional.

Never open, puncture, or disassemble the battery pack, and never bypass the BMS. See our safety guide.

More codes for H700

42 · Total voltage from the battery is too high/low 43 · Total power from the battery cells is too high 44 · Voltage of the single cell is too high 46 · Battery temperature is too low 47 · SOC of the battery is too high 48 · SOC of the battery is too low

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Sources & verification

Last verified: pending review Reviewed by: editorial team

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