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Hailong Battery Cases

The universal fitment. Waterproof ABS and PC+ABS shells with key lock, cable exit and mounting kit options, sized for 18650 or 21700 packs.

14 models 36 V – 72 V 18650 / 21700 MOQ 1 piece

Showing the 14 models with a full spec page. The complete range of 14 is shown below. Every one is an empty shell — you supply cells, BMS and harness. Measured openings and cell ceilings for every model: see the full dimensions table.

How many Hailong empty battery cases are there?

14 — every one with its own spec page and a measured drawing. Every Hailong-pattern housing we mould is listed below. All are empty housings: no cells, no BMS.

ModelCellsCommon configurationsOpening / sizeFitmentMaterialVoltage
ALX019A18650 — 52 cells · 21700 — 40 cells18650: 13S4P · 10S5P · 16S3P · 14S3P · 21700: 10S4P · 20S2P · 13S3P · 16S2P——ABS36 V – 72 V
ALX019B18650 — 78 cells · 21700 — 52 cells18650: 13S6P · 10S7P · 14S5P · 16S4P · 21700: 13S4P · 10S5P · 16S3P · 14S3PBody 368.28 mm long—ABS48 V
ALX053B18650 — 78 cells18650: 13S6P · 10S7P · 14S5P · 16S4PBody 122.3 mm wide × 404.33 mm longMounting centres 73 / 73 / 162.19 mmABS + PC36 V – 72 V
ALX053C18650 — 78 cells18650: 13S6P · 10S7P · 14S5P · 16S4P——ABS36 V – 72 V
ALX06818650 — 52 cells · 21700 — 30 cells18650: 13S4P · 10S5P · 16S3P · 14S3P · 21700: 10S3P · 14S2P · 13S2PBody 89.58 mm high × 396.49 mm longMounting centres 171.61 / 70.5 / 65.75 mmABS36 V – 72 V
ALX08218650 — 91 cells · 21700 — 52 cells18650: 13S7P · 10S9P · 14S6P · 16S5P · 21700: 13S4P · 10S5P · 16S3P · 14S3PTube length 341.6 mm Body 396.56 mm long × 122.02 mm highCharge port DC1.2 / DC2.5 / 3-pin microphone or videoABS48 V
ALX09618650 — 52 cells · 21700 — 30 cells18650: 13S4P · 10S5P · 16S3P · 14S3P · 21700: 10S3P · 14S2P · 13S2PBody 112.55 mm high × 396.49 mm longMounting centres 171.61 / 73 / 73 mmABS36 V – 72 V
ALX09718650 — 78 cells · 21700 — 52 cells18650: 13S6P · 10S7P · 14S5P · 16S4P · 21700: 13S4P · 10S5P · 16S3P · 14S3PTube length 386.5 mm—ABS36 V – 72 V
ALX097B21700 — 52 cells21700: 13S4P · 10S5P · 16S3P · 14S3PTube length 386.5 mm Body 94.21 mm × 164.52 mmMounting centres 73 / 73 mmABS36 V / 48 V
ALX09818650 — 65 cells · 21700 — 40 cells18650: 13S5P · 16S4P · 10S6P · 20S3P · 21700: 10S4P · 20S2P · 13S3P · 16S2PBody 396.49 mm longMounting centres 171.61 / 73 / 73 mmABS36 V
ALX14618650 — 65 cells · 21700 — 40 cells18650: 13S5P · 16S4P · 10S6P · 20S3P · 21700: 10S4P · 20S2P · 13S3P · 16S2PTube length 306.63 mm Body 95.3 mm × 368.63 mmMounting centres 171.1 / 57 / 57 mmABS48 V
ALX149A18650 — 104 cells · 21700 — 70 cells18650: 13S8P · 10S10P · 20S5P · 14S7P · 21700: 10S7P · 14S5P · 13S5P · 16S4PTube length 363.65 mm Body 96.58 mm highMounting centres 161.15 / 71.9 / 72.1 mmABS48 V / 60 V
ALX149B18650 — 117 cells · 21700 — 80 cells18650: 13S9P · 14S8P · 16S7P · 10S10P · 21700: 10S8P · 16S5P · 20S4P · 13S6PTube length 386.52 mmMounting centres 161.15 / 71.9 / 72.1 mmABS36 V / 48 V
ALX149D21700 — 100 cells21700: 10S10P · 20S5P · 14S7P · 16S6P——ABS36 V – 72 V
About this series

Why do assemblers choose a Hailong case?

14 Hailong models across 36 V – 72 V systems, on 18650 and 21700 cells — empty shells, MOQ one piece. The universal fitment. Waterproof ABS and PC+ABS shells with key lock, cable exit and mounting kit options, sized for 18650 or 21700 packs.

Hailong is the housing profile most e-bike assemblers re-order, because it fits the widest range of frames without modification. The case sits on the down-tube on a separate dock, so the pack can be removed for charging or storage.

Our Hailong range covers the working voltages from 36 V to 72 V and both 18650 and 21700 cell formats. Waterproof construction is standard, flame-retardant grades are available on selected models, and the whole range is offered as empty shells with selectable cable-exit positions and mounting arrangements.

If you are replacing an existing Hailong case or building a first prototype, order a single piece — the minimum is one unit and there is no sampling fee.

Also known as: buyers also shop for this profile as a Shark case (the larger Hailong-pattern body) or simply as a down-tube battery case. The names describe the shape, not one factory — our Polly, Dolphin and Shark size guide maps what each name actually means.

  • Runs 36 V to 72 V — One housing family across the voltages your range actually covers.
  • Key lock as standard on most models — Anti-pick brass cylinder, two keys supplied.
  • Mounting kit and cable exit to order — Built to your assembly process, not ours.
  • MOQ 1 piece — Validate the fit before committing to a container.
Get a Quote Compare all six formats
Hailong battery case mounted on the down-tube of a mountain e-bike
Hailong on a hardtailDown-tube dock, removable pack
Other fitments

Which mounting format fits your frame instead?

Six mountings, six jobs: Hailong and Silver Fish dock on the down-tube, integrated moulds into the frame, downtube suits standard tubes, rear rack carries cargo, and water bottle fits small packs. Choose by frame first, then by cell count.

Silver Fish Battery Cases

Tapered shells that slide into a frame or seat-post carrier — the retrofit standard for folding bikes, mountain frames and conversion builds.

Integrated & In-Frame Battery Cases

Hidden housings that sit inside the down-tube, plus conversion kits with aluminium-alloy reinforcement.

Downtube Battery Cases

Bolt-on housings that mount above or below the down-tube, taking 18650 packs to 104 cells. The largest family we hold tooling for.

Rear Rack Battery Cases

Flat rack-mounted housings for cargo, delivery and long-tail builds — to 104 cells, without widening the bike.

Water Bottle Battery Cases

Mounts on standard bottle bosses — the lowest-cost way to add range to a frame with no down-tube space.
Ten Haitian injection moulding machines running in a line at the ALX factory in Guangzhou
Moulded in house10 Haitian injection moulding machines
Finished e-bike battery cases racked ready for dispatch
Racked and readyEmpty shells, inspected before dispatch
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Tell us your voltage, cell type and dimensions

That is all we need to point you at the right case. Quoted within five hours, MOQ one piece.

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Common questions about Hailong

How many cells fit in a Hailong battery case?
Across our 14 Hailong housings the largest mould takes 117 cells on 18650 and 100 on 21700 — the same mould physically holds fewer of the fatter 21700 format. Cell count per model is listed on each product page.
What voltages do Hailong cases cover?
Across the 14 models the range spans 36 V to 72 V. Voltage follows the cell count you build to — 10S is 36 V, 13S is 48 V, 14S is 52 V — so pick the case by cells, not by the label voltage.
Can I order a single Hailong case?
Yes — MOQ is one piece on every model in this series, quoted within five hours. Single-piece orders ship from stock for the common moulds; rare configurations are moulded to order.
What is a Hailong battery case?
The dock-format case that sits on the down tube with a removable pack — the most common shape in e-bike conversion. Ours are moulded in ABS+PC, with an aluminium variant for the models that run hot.
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