Frisco E-Bike
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Representative photo. Product photos and current options are on the Amazon listing.

E-Bike Batteries

52V 20Ah Hailong Downtube Battery (generic)

A 52V 20Ah pack is what people buy when they want more range and a little more punch from a bike or conversion kit that can tolerate it. The 52V nominal (58.8V full) is a drop-in for many 48V controllers whose capacitors are rated for it, but not all, so this is an upgrade that requires confirmation. At 20Ah the pack is long and heavy, usually in the taller Hailong-3, DK or Jumbo Shark style case, which will not fit every frame triangle. Measure your downtube clearance before you order and expect to also buy a 52V charger.

Riders who want a long-range upgrade on a compatible 48V/52V systemMid-drive kits (BBS02/BBSHD) that accept 52VLarger frames with room for a long downtube case

Current price and availability are shown on Amazon.

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Key considerations

  • Your controller and display must accept 52V — check the published input range, not just the sticker
  • Case length: 20Ah cases are long; measure the downtube and bottle bosses
  • Needs a 52V (58.8V) charger — a 48V charger will not fully charge it
  • BMS amp rating should comfortably exceed your controller's peak draw

Pros

  • Roughly 50% more energy than a 48V 13Ah pack
  • Slightly stronger acceleration on compatible systems
  • Common case style with many cradle options

Considerations

  • Heavy and long
  • Not a safe drop-in for every 48V bike
  • Requires a new charger

Features & specifications

Nominal voltage52V
Capacity20Ah

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

Compatibility notes

  • Only for systems whose controller and display are published as 52V-capable (or 48V/52V dual rated)
  • Confirm Hailong case generation and cradle connector before ordering

If a pack arrives swollen, hot, or smelling burnt, stop and get an E-Bike Assessment or a professional before using it.

Keep it running

Replacement parts

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

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E-Bike Battery Chargers

52V 2A E-Bike Charger, 3-Pin XLR Plug (generic)

A 52V pack needs a 58.8V charger, and the 3-pin XLR plug is the most common fitting on the 52V Hailong and rack packs sold to kit builders. Mixing this up with a 48V charger is a classic mistake: a 54.6V charger will leave a 52V pack permanently under-charged, while a 58.8V charger on a 48V pack is dangerous. This generic 2A unit is the slow-and-steady option; heavier packs may benefit from a 3A or 5A unit if the BMS allows it. Confirm the XLR pin assignment matches your battery before the first plug-in.

Best for: 52V Hailong or rack-mount packs with an XLR charge port · BBS02/BBSHD builds running 52V · Riders who lost or wore out the original 52V charger

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E-Bike Motors

Bafang BBSHD 48V/52V 1000W Mid-Drive Conversion Kit

The BBSHD is the BBS02's bigger sibling: a 1000W nominal mid-drive with a beefier case, a 30A controller, and a reputation for taking abuse that the BBS02 would not survive. It is the pick for heavy riders, cargo hauls, steep terrain, and fat-bike conversions, and it is happy on 52V packs. The trade-offs are weight, a wider Q-factor at the pedals, and more chain wear than any hub motor. Like the BBS02, it ships as a kit without a battery and needs a threaded bottom bracket shell in the matching width.

Best for: Heavy riders and cargo conversions · Fat bikes (100/120 mm shell versions) and steep hills · Riders who want more headroom than a BBS02B

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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

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