YOSE POWER Hailong Battery Review: 36V Down Tube Pack With Up to 740Wh

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If you’re building a DIY e-bike or replacing a tired battery, the Hailong-style down tube pack is the most common shape you’ll see. The YOSE POWER 36V Hailong 1-2 Down Tube Battery is the top seller in YOSE POWER’s battery collection. It comes in two capacities, 15.6Ah for €219 and 20Ah for €259, and it had a 4.72-star average from 29 customer reviews when we checked.

For this YOSE POWER Hailong battery review, we went through the full technical data, packing list and spec images, read the customer reviews (including the critical ones), and compared it with YOSE POWER’s other 36V down tube batteries. The key points are capacity, range, compatibility and one plug detail that’s easy to miss.

Quick Specs

• Price: €219 (15.6Ah) or €259 (20Ah), free shipping
• Voltage: 36V nominal, 42V full charge, 28V cut-off
• Energy: 577Wh (15.6Ah) or 740Wh (20Ah)
• Cells: High-power 18650 lithium-ion
• Current: 10A standard, 30A max, 60A protection
• Cycle life: 1,000+ cycles
• Size: 367 × 90 × 111mm
• Weight: about 3.5–3.8kg
• Charger: 42V 3A (EU plug) included
• Motor compatibility: 36V motors from 250W to 900W, per the listing
• Warranty: 18 months on the battery, 12 months on the charger

A quick note on the energy figures: 15.6Ah × 36V would be about 562Wh. YOSE POWER’s numbers work out to a 37V nominal cell voltage, which is common for lithium-ion packs, so the Wh ratings are consistent with each other.

What’s in the Box

You get the battery, a 42V 3A charger with an EU plug, two keys and a discharge connector. YOSE POWER also notes that an XT60 adapter is included in the parcel. The mounting rail screws onto your frame’s bottle cage bosses.

YOSE POWER Hailong Battery Review: Key Features

Two capacities for different ranges

The 15.6Ah version suits most commuters, while the 20Ah version adds about 28% more energy for €40 extra. YOSE POWER’s range graphic for the 15.6Ah pack quotes 55–60km in full power mode and 180–190km in eco mode, tested with a 72kg rider, 20°C temperature and a 36V 350W motor on pedal assist. The eco figure is a best case; most riders will land somewhere in between depending on assist level, hills and weight.

Practical everyday details

The battery has a push-button level indicator with four lights, a key lock to secure it to the frame, an on/off switch and a USB socket (5V 1A) that can top up your phone. A smart BMS (battery management system) handles short-circuit, overcharge, over-discharge, overcurrent and temperature protection.

Fits standard bottle cage mounts

The Hailong case mounts on the down tube using the bottle cage bolts. YOSE POWER publishes the rail’s hole spacing so you can check it against your frame before ordering. You also need enough room on the down tube for a 367mm-long pack, which can be tight on small or step-through frames.

The Plug Detail You Shouldn’t Miss

This Hailong 1-2 battery uses a 4-pin discharge port. YOSE POWER points out that it’s completely different from its other 36V Hailong batteries, which use 5-pin plugs. If you’re replacing an existing battery and want to reuse your current mounting rail, match the plug and rail exactly, or replace both. For new builds, the included discharge connector and XT60 adapter make wiring to a controller straightforward.

What Customers Say

Most of the 29 reviews are positive. Repeat buyers mention ordering from YOSE POWER for several DIY builds, and one rider with the 20Ah version reported around 120km of range. Others praise fast delivery and careful packaging.

The critical reviews are useful too. One buyer felt their 20Ah battery dropped to 54% after a 37km ride and suspected lower real capacity; YOSE POWER replied suggesting a connection check and calibration. Another said the battery arrived fully discharged, with no indicator lights until charged. One customer had a delayed DHL delivery, which YOSE POWER handled through its shipping insurance. None of these are unusual for e-bike batteries, but they’re worth knowing: charge fully on arrival and do a couple of complete cycles before judging range.

How It Compares With Other YOSE POWER Down Tube Batteries

Battery	Price	Energy	Plug
Hailong 1-2, 15.6Ah (this one)	€219	577Wh	4-pin
Hailong 1-2, 20Ah (this one)	€259	740Wh	4-pin
Hailong 13Ah	€209	481Wh	5 gold-plated round pins
Hailong-Plus 15.6Ah	€239	577Wh	5 flat pins, USB
Hailong-MIX 18Ah	€249	666Wh	5 gold-plated round pins

For a new build, the Hailong 1-2 is the better value: the 15.6Ah version costs only €10 more than the 13Ah pack for about 20% more energy, and the 20Ah gives the most capacity in this group. If you’re replacing a YOSE POWER battery that uses a 5-pin plug, one of the 5-pin options will be the easier swap.

Who It’s For

• DIY builders pairing a 36V conversion kit with a down tube battery.
• Commuters who want more range than a 13Ah pack.
• Riders in Europe who want fast delivery from a German warehouse.
• Anyone with a 36V motor between 250W and 900W.

Who It’s Not For

• Owners of 48V or 52V systems: this is a 36V pack.
• Small or step-through frames without room for a 367mm battery.
• Like-for-like replacements of 5-pin Hailong packs, unless you also change the rail.
• Brand-name e-bikes with integrated or proprietary batteries (Bosch, Shimano and similar).

Pricing, Shipping and Warranty

The battery costs €219 (15.6Ah) or €259 (20Ah) on the YOSE POWER store, with free shipping and insured delivery. Batteries ship from German warehouses within two working days. The product listing quotes 2–4 working days to Germany and 4–8 to other countries, while the store FAQ says 3–5 days for other countries, so allow up to about a week outside Germany. YOSE POWER offers a 30-day return policy, an 18-month battery warranty, a 12-month charger warranty and long-term parts support.

Pros and Cons

Pros

• Up to 740Wh in a standard Hailong down tube case
• Good value compared with YOSE POWER’s other 36V packs
• Works with 36V motors from 250W to 900W
• Level indicator, key lock, power switch and USB output
• Smart BMS protection
• Free, insured shipping from Germany; 18-month battery warranty

Cons

• 4-pin plug isn’t compatible with YOSE POWER’s 5-pin Hailong rails
• Range claims (up to 190km in eco) are optimistic
• Heavy at up to 3.8kg
• One reviewer questioned the 20Ah version’s real capacity
• Delivery times differ slightly between the listing and the FAQ

FAQ

Is this battery compatible with my conversion kit?

It works with 36V motor kits from 250W to 900W, according to YOSE POWER. Check that your controller’s connector matches or use the included discharge connector and XT60 adapter.

How far can I ride on one charge?

YOSE POWER quotes 55–60km in full power mode and up to 180–190km in eco mode for the 15.6Ah version under ideal test conditions. One customer reported about 120km with the 20Ah version.

How long does it take to charge?

YOSE POWER’s spec graphic lists about 6 hours for the 15.6Ah version with the included 3A charger.

Can it charge my phone?

Yes. It has a 5V 1A USB socket.

What warranty does it have?

18 months on the battery and 12 months on the charger.

YOSE POWER Hailong Battery Review: Bottom Line

The YOSE POWER Hailong 1-2 down tube battery offers a lot of capacity for the money, especially the 20Ah version at €259. It has the practical features you’d expect, solid BMS protection, fast insured shipping within Europe and an 18-month warranty. Just check three things before ordering: that you’re running a 36V system, that your frame has room and the right bottle cage mounts, and that the 4-pin plug suits your setup.

That wraps up our YOSE POWER Hailong battery review. Check current capacities and stock on the official YOSE POWER store.

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