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Downtube E-Bike Batteries (Hailong, Polly & ALX)Downtube E-Bike Batteries (Hailong, Polly & ALX) 2Downtube E-Bike Batteries (Hailong, Polly & ALX) 3Downtube E-Bike Batteries (Hailong, Polly & ALX) 4Downtube E-Bike Batteries (Hailong, Polly & ALX) 5Downtube E-Bike Batteries (Hailong, Polly & ALX) 6Downtube E-Bike Batteries (Hailong, Polly & ALX) 7Downtube E-Bike Batteries (Hailong, Polly & ALX) 8Downtube E-Bike Batteries (Hailong, Polly & ALX) 9Downtube E-Bike Batteries (Hailong, Polly & ALX) 10Downtube E-Bike Batteries (Hailong, Polly & ALX) 11Downtube E-Bike Batteries (Hailong, Polly & ALX) 12Downtube E-Bike Batteries (Hailong, Polly & ALX) 13

Downtube E-Bike Batteries (Hailong, Polly & ALX)

Yizhan downtube e-bike battery packs in Hailong, Polly and ALX cases — 24V-52V, 5-25Ah, 18650/21700 cells, UL 2271 and EN50604 options, OEM-customizable.

At a glance

Brand
Yizhan
Nominal voltage
24V–52V
Capacity range
5–25Ah
Cell chemistry
Li-ion (18650 / 21700)
Application
Downtube-mounted e-bike packs in industry-standard case styles
  • Thirteen pack models across Hailong, Polly (DP), ALX, Ouxi V8, Aulong and Cuttle case styles
  • Voltage options 24V-52V, capacities from 5Ah city packs to 25Ah long-range
  • UL 2271, UL, UN38.3, MSDS and EN50604 certification options per model
  • Customizable voltage, capacity, BMS, connectors, branding and packaging
Get a Quote

Downtube packs in the case styles the e-bike industry already knows — Hailong, Polly (DP), ALX, Ouxi V8, Aulong and Cuttle — so replacement and OEM builds bolt straight onto existing mounts. Voltage runs 24V through 52V with capacities from compact 5Ah city packs to 25Ah long-range builds, and most models can be certified to UL / UN38.3 / MSDS / EN50604 on request.

These are wholesale, quote-only products. Tell us your case style, voltage, capacity, connector and certification requirements and we will confirm pricing and lead time.

Models & specifications

ModelVoltageCapacityCells / notesCertifications
Hailong 136V / 48V10–17.5AhMax 52 × 18650 or 30 × 21700On request
Hailong 1-236V / 48V10–21AhSix capacity stepsUL / UN38.3 / MSDS / EN50604
Hailong G8036V / 48V18 / 20 / 25AhHigh-capacity caseUL / UN38.3 / MSDS / EN50604
Hailong 48V 13Ah48V13Ah (624Wh)—UL 2271
Ouxi V8 (ALX Hailong)36V / 48V10–17.5Ah—On request
Polly DP-9 / DP-9C36V / 48V / 52Vto max cell countMax 91 (DP-9) / 84 (DP-9C) cellsOn request
Polly DP-5 / DP-5C36V / 48V / 52Vto max cell countMax 56 (DP-5) / 52 (DP-5C) cellsOn request
Polly 52V 20Ah52V (24V–48V custom)20Ah—On request
ALX 09736V / 48V15.6 / 18 / 20AhCustom BMS, connectors, brandingOn request
Aulong 336V / 48Vby cell choice3500mAh or 5000mAh cellsEN50604
Cuttle 24V 7Ah24V / 36V / 48V5–10.5AhCompact commuter packOn request
Cuttle downtube24V / 36V5–15Ah (192–240Wh)For 250W motors, approx. 24–60 km rangeOn request
UL 48V 20Ah downtube48V20AhLong-range buildUL

Why this line

  • Industry-standard case styles — drop-in fit for existing Hailong/Polly/ALX mounts
  • OEM service: voltage, capacity, BMS rating, discharge leads, connectors, logo and packaging all customizable
  • Certification to UL 2271 / UL / UN38.3 / MSDS / EN50604 available per model
  • Wholesale supply direct from the pack factory