Frisco E-Bike
Bike tools organized on a workshop rack

Representative photo. Product photos and current options are on the Amazon listing.

E-Bike Batteries

36V 10Ah Hailong Downtube Battery (generic)

Many budget 36V e-bikes and conversion kits use an unbranded Hailong-case battery, and when one dies the replacement is usually another unbranded Hailong-case battery. The listings all look alike, so the job is to match four things: 36V nominal (42V fully charged), the correct Hailong case generation, the discharge connector on your cradle, and a BMS that can feed your controller. A 10Ah pack is a modest capacity, suited to 250W–500W bikes that see neighborhood and short-commute duty. Choose a listing that states the BMS amp rating and ships with a charger.

Replacing a worn-out 36V Hailong pack on a budget commuter or folding bike36V 250W–500W conversion kits with a Hailong cradleRiders who only need 15–25 miles of assisted range

Current price and availability are shown on Amazon.

See Current Amazon Listing

Affiliate Disclosure: We may earn a commission when you purchase through links on this page, at no additional cost to you. Details

We link to Amazon search results for this model so you always see the current listing and variants. Amazon is the seller; we are not.

Key considerations

  • Verify 36V by reading the label on your old pack or measuring a fully charged pack near 42V
  • Match the case generation and the cradle's discharge plug before ordering
  • Ask the seller for the BMS continuous discharge rating and make sure it exceeds your controller's rating
  • Low-cost packs vary in cell quality; expect the published Ah to be optimistic

Pros

  • Inexpensive route back to a working bike
  • Standard Hailong mount fits many cradles
  • Small and light

Considerations

  • Limited range
  • Seller and cell quality are inconsistent
  • No brand accountability if it fails

Features & specifications

Nominal voltage36V
Capacity10Ah
CaseHailong downtube

Specifications are manufacturer-published figures or our own notes; confirm on the current listing before purchase.

Compatibility notes

  • For 36V systems only; do not use on a 48V controller
  • Hailong downtube cradles — confirm the case generation and connector on your bike

Keep it running

Replacement parts

Confirm fitment on your bike before ordering — see each part’s compatibility notes.

Compare

Similar alternatives

All e-bike batteries →
Bike tools organized on a workshop rack
E-Bike Battery Chargers

36V 2A E-Bike Charger, DC Barrel Plug (generic)

Most 36V e-bikes and scooters charge through a 42V output brick with a DC barrel plug, and this is the generic replacement for that brick. The important number is 42V on the output label (10-series lithium-ion), with 2A being the standard rate. Plugs are the confusing part: 36V bikes use 5.5x2.1 and 5.5x2.5 mm barrels most often, and some use a 3-pin XLR or a proprietary plug instead. Look at your battery's charge port and your old charger before ordering, and prefer a listing that shows the plug diameter clearly.

Best for: Replacing the charger on a 36V folding or commuter e-bike · 36V conversion kit batteries with a barrel charge port · A spare for the office

View details & where to buy

Sold on Amazon

Close-up of bicycle gears and chain
E-Bike BatteriesFeatured

Unit Pack Power 48V 13Ah Hailong Downtube Battery

Unit Pack Power (UPP) is one of the longest-running aftermarket battery sellers on Amazon, and this 48V 13Ah pack in the familiar Hailong bottle-style case is their bread-and-butter product. It is the pack people reach for when a Hailong-mount bike from a lesser-known brand has a dead battery and the manufacturer is no longer answering email. The case has a built-in key lock, a USB port on most versions, and a standard Hailong slide rail. The 13Ah capacity puts it in the middle of the range: enough for most commutes, not a long-range upgrade.

Best for: Replacing a dead Hailong-style downtube pack on a 48V bike · Conversion kits using a Hailong mounting plate · Riders who want a known seller with a warranty process rather than a no-name listing

View details & where to buy

Sold on Amazon

Affiliate Disclosure: We may earn a commission when you purchase through links on this page, at no additional cost to you. Details