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1. This Hailong plus style battery can easily fits and mounts on most bike frames
2. With 2pcs safe lock for security
3. Convenient charge port and discharge port
4. USB port can charge cellphone or other device
5. LED light charge-level indicator
6. With on/off switch power button
Battery parameters | ||||||
Model | S039-5 | |||||
Battery type | Li ion Battery | |||||
Rated Voltage | 48V | |||||
Rated Capacity | 21Ah | |||||
Battery cell | INR18650-35E cells | |||||
Dimension(mm) | 365*90*120 | |||||
Battery weight | 5.1KG | |||||
BMS current | 30A fit for 500w 750w 1000w motor | |||||
Max.charge current | 5A | |||||
Charge voltage | 54.6v | |||||
Discharge cut-off voltage | 36.4v | |||||
Charger | 2.5A charger default 2A/3A/4A/5A charger can optional | |||||









1. Electric bicycle batteries with US EU UK AU charger AC plug,it will be matched as delivery country if without request.
2. There are 10 different kinds of electric bike battery discharge connectors available for you to choose, if without request will shipping with 250mm naked cables.



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1. Your inquiry related to our products will be replied in 12 hours.
2. Experienced staffs to answer all your enquires in fluent English.
3. We make the OEM and ODM service for more than 5 years. And the Paypal accepted.
4. Protection of your sales area, ideas of design and all your private information.
5. No matter big order or small order , we will provide all the best quality , best service.
6. If our products have any problem that we caused, they will be sent free in the next order.
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Never put batteries into fire or heat. keep batteries in a cool dry place.
Never reverse positive and negative terminals to use batteries.
Never disassemble or modify batteries.
Do not short circuit the (+) and (-) terminals with other metals
Do not store batteries with such objects Hair-pins, coins or screws.
Do not hit with a hammer, step on or throw batteries.
Do not solder batteries directly.
Do not penetrate batteries by nail or other tools.
Q1: Are you factory?
A1: Yes, our factory is in Shenzhen, china. Specializing in rechargeable batteries. Lithium ion batteries, lithium batteries and power batteries and chargers for more than 10 years.
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Q2: Do your e-bike battery come with charger?
A2: All of our e-bike batteries come with charger.We have normal charger and fast charger.If you need fast charger please contact with us.
Q3: Do your electric bike batteries come with BMS?
A3: Yes, Our batteries all with SEIKO IC BMS, with stable performance.Which can protect the battery avoid short circuit,Overcharged,Overdischarge and Overcurrent.
Q4:What is your delivery date?
A4: Electric Bike Battery will be sent out within 7 days after confirmed order,shipping will cost 3-15days,it depend on quantity and which battery you need.
Q5:How long is the battery expected to last?
The battery should have around 800-1200 recharge cycles, about 2-3 years.Its capacity diminishes over time, when it goes down to 75%, you should replace it.The more you use the bike, the better the battery retains its capacity, since it keeps the Lithium moving.
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Q6: How to maintain the battery?
A: The battery should be stored in clean, dry, ventilated, dark environment when not using.keep it after full charge,recharge it every 3 months or 6 months.
Q7:What about after-sale service?
A7: We will offer you 1 year guarantee. If there are any problems, please inform us, we will offer you positive solutions.Besides,we also have office and warehouse in US/Germany,can give you better after-sale service.
Q8: Can you provide OEM and ODM service?
A8: Yes, We are a professional Electric Bike Battery manufacture with factory, which produce all kind of high quality Ebike lithium batteries as customers' requirements and designs, welcome to place OEM and ODM orders and visit our factory.
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