Charging Faults

Diagnosing charging problems, battery not charging, and low-voltage error codes.

Code	Meaning
E06	Low Voltage Protection
E12	BMS Communications Error

Full definitions: Display & Error Codes.

Before charging

Do not charge immediately after a ride. Wait for the battery to cool down first.

Charging procedure (D-series)

Remove the battery from the battery compartment if your model has a removable battery (D02 Track), or charge in place.
Insert the charger plug into the battery charging socket.
Insert the charger power plug into the power supply socket.
Allow to charge fully: approximately 6 hours for 48V models, 7–8 hours for 72V models.
Disconnect the charger from the mains first, then from the battery.

Charging rules

Charge only with the supplied, compatible charger.
Do not charge when the slot or socket is damp.
Use the correct power source for your market — D-series chargers in the U.S. use a two-prong plug.
Keep away from children, pets and flammable materials while charging.
Charge and store at a reasonable temperature. Extreme cold or heat permanently damages the battery.
For long-term storage, top up the battery about every 15 days and disconnect the charger after charging. See Battery Care & Charging.

Symptom: the battery will not charge

Video: CEMOTO Battery Not Charging? What Would You Check First? — see Technical Guides.

During normal charging, the charger LED is red and turns green when charging is complete. If an empty battery shows green immediately, treat it as a charging fault and follow the checks below.

After riding

Do not charge immediately after a ride. Wait for the battery to cool down first. If the battery is too hot, its protection may stop it from charging.

If the battery still will not charge

Once the battery has cooled down, try both:

Charge with the battery on the bike, using the original supplied charger and the bike's charging port.
Take the battery off the bike, unplug all other connectors from the battery, and connect only the original charger.

Unplug the charger from the wall before changing connections or removing the battery. Connect the charging plug first, then plug into the wall. When finished, unplug from the wall first.

If neither method works, contact support. Do not try these steps on a damaged, swollen or wet battery.

Still not charging? Send these details to support

Send your bike model, order number, charger-light colour and a photo or short video. Tell us that you tried both charging methods after the battery cooled.

You do not need a meter or electrical knowledge. Support can arrange checks of the charger, battery and wiring. Do not open the battery or charger, bypass battery protection or try another charger to revive the battery.

Symptom: charging is very slow

Compare actual charge time against the expected figure (~6 hours for 48V, 7–8 hours for 72V). A marginal increase is normal as the battery ages or in cold weather.
Confirm the charger matches the battery: a 48V charger on a 72V battery (or the reverse) will not charge correctly and may indicate a fault code.
A charger with a damaged cable can deliver reduced current.

E06 or E12 on the display

E06 means low-voltage protection. Let the battery cool if hot and charge with the original charger. If E06 returns after charging, contact support. Do not lower protection settings or change battery-voltage settings to clear it.

E12 means a communication problem with the battery protection electronics, called the BMS. With power off and the charger unplugged from the wall, check the battery is seated correctly. Contact support if it remains.

See Display & Error Codes.

Symptom: the battery charges but drains immediately

Cold weather significantly reduces usable capacity. Expect a meaningful reduction in winter.
Age. Rechargeable batteries have a finite life. Average lifespan is 1 to 2 years, depending on conditions and usage. Capacity loss is gradual and normal.
Charger output. A weak charger can produce an apparent full charge that is in reality a partial one.
Load conditions. High speed, hills, wind, heavy loads and under-inflated tires all increase consumption. See Range & Performance.

Battery degradation reference

The owner manual notes that usable capacity varies with battery temperature:

Battery temperature	Approximate available capacity
14 °F	~70 %
32 °F	~80 %
70 °F	~90–95 %

This is why a bike used in winter reports a noticeably shorter range on the same charge.

Battery warranty exclusions

Battery warranty does not cover failures caused by:

Use of non-certified chargers
Overcharging or deep discharge
Physical impact or water intrusion
Seal tampering or unauthorized disassembly
Use in non-approved devices

A replacement will be provided where the discharge meter detects less than 70 % of available capacity, or where the voltage is abnormal and the battery cannot be charged — subject to the exclusions above. Battery replacement does not extend the original warranty period and does not qualify for cash reimbursement.

See Warranty and Battery Care & Charging.