Description
A battery is the only part of an e-bike that decides how far home is. Frames, brakes and motors are visible, so they get all the attention. The battery sits hidden in the downtube and quietly determines whether a 40 km ride is a round trip or a one-way trip with a phone call at the end. When a pack starts sagging under load, the symptom is never announced: the motor cuts out on the same hill it used to climb, range drops by a third, and the charger spends less time in constant-current mode. This is the replacement that ends that conversation.
The pack uses the Hailong mounting pattern, which is the closest thing the e-bike world has to a standard, so it slots into the frame bracket thousands of commuter, cargo and conversion builds already use. Configurations cover 36V and 48V systems with 10 to 20Ah capacity, and cell options span G2500, G3000, 18650 and TSL 21700 grades so you can weight the pack toward budget or toward cycle life. The BMS is rated at 20A for 36V builds and 30A for 48V and 52V builds, matching motors from 250W commuter hubs through to 1500W Bafang BBS01 and BBS02 conversion kits.
Cycle life is rated at 800 to 1000 full cycles, working temperature spans -20 to 65 °C, and the pack weighs between 3 kg and 4.5 kg depending on the configuration. Dimensions vary by cell layout - 360 x 90 x 90 mm up to 360 x 90 x 150 mm - so measure your frame bracket before ordering, or tell us your bike model and we will confirm the fit. Every pack carries a 12-month warranty.
Range is not a specification. It is the freedom to take the long way home.
Key Features
- ✦ Hailong mounting pattern, compatible with the most widely used e-bike frame brackets.
- ✦ 36V and 48V configurations with 10-20Ah capacity for commuter, cargo and conversion builds.
- ✦ Cell options across G2500, G3000, 18650 and TSL 21700 grades - budget to long-life.
- ✦ BMS rated 20A for 36V and 30A for 48V/52V, matching motors from 250W to 1500W.
- ✦ Cycle life of 800-1000 full charges, with a 12-month warranty on every pack.
- ✦ Operating range of -20 to 65 °C for year-round commuting in cold or hot climates.
- ✦ Charger pairing available at 42V 2A for 36V packs and 54.6V 2A for 48V packs.
Technical Specifications
- Product: Hailong-pattern e-bike battery pack
- Voltage Options: 36V / 48V / 52V
- Capacity Options: 10 - 20Ah (36V 13/15/17.5/19.2Ah; 48V 12/14/14.4Ah and above)
- Cell Options: G2500 / G3000 / 18650 / TSL 21700 grades
- BMS Rating: 20A for 36V; 30A for 48V and 52V
- Motor Compatibility: 250W / 350W / 500W / 750W / 1000W / 1500W, incl. Bafang BBS01 and BBS02
- Cycle Life: 800 - 1000 cycles
- Charger: 42V 2A (36V) / 54.6V 2A (48V)
- Dimensions: 360 x 90 x 90 mm / 360 x 95 x 110 mm / 360 x 90 x 127 mm / 360 x 90 x 150 mm
- Weight: 3 - 4.5 kg by configuration
- Working Temperature: -20 to 65 degrees C
- Certification: CE
- Warranty: 12 months
Where It Works
The people who buy this pack are not shopping for a first e-bike. They are replacing a tired battery on a bike they already like, adding a second pack so one can charge while the other rides, upsizing capacity on a cargo bike that now carries children or deliveries, or building a conversion kit onto a frame they trust. It also suits workshops and rental fleets that keep spare packs on the shelf rather than turning away a customer whose bike will not charge. In all four cases the calculation is the same: the pack is a fraction of the price of a new bike and it restores the range the bike was sold with.
Frequently Asked Questions
Q: How do I know which voltage and capacity to order?
A: Match the voltage to your existing motor and controller - a 48V motor needs a 48V pack, and mixing them will not work. For capacity, take your current Ah rating as the floor and go up if you want more range, remembering that a larger pack adds weight. Send us the bike model and motor wattage and we will confirm the configuration.
Q: Will it fit my frame?
A: The Hailong pattern is the industry-standard bracket for thousands of commuter and conversion bikes, but the physical pack dimensions vary by cell layout. Compare the four listed dimensions against your existing pack or bracket before ordering - 360 mm length across all variants, with height and width differing by configuration.
Q: What is the difference between the cell grades?
A: Cell grade sets the trade-off between price, capacity and cycle life. Budget 18650 grades are fine for short commutes; higher grades hold voltage under load for longer and last more cycles. If you ride daily and charge every night, the better cell pays for itself over the life of the pack.
Q: How long will the pack last?
A: The manufacturer rates 800 to 1000 full cycles, which for a daily commuter is several years of service. Real life depends on how you treat it: charge at normal temperatures, avoid leaving it fully charged in summer heat, and store it around half charge over winter.
Q: Can I charge it on the bike?
A: Yes, the pack charges in the frame bracket with the matching charger. A 42V 2A charger suits 36V packs and a 54.6V 2A charger suits 48V packs. Match the charger to the pack voltage exactly - a mismatched charger is the fastest way to destroy a battery.
Q: Is the BMS rating high enough for a 1500W motor?
A: The 48V and 52V packs use a 30A BMS, which covers 1500W conversion kits when paired with a controller that respects the current limit. If your controller draws more than the BMS allows, the pack will cut out under hard acceleration. Check your controller rating before you buy, or ask us and we will match it.
The EastSupplier Promise — every unit is inspected, packed for export, and shipped from a vetted factory line. If the specification differs from what is described here, we replace it. No middlemen, no relabelled stock, no surprises at the border.
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