H HAILONG 36V 48V 52V EBike Lithium Battery Pack - Compact Power

In this review the H HAILONG 36V 48V 52V lithium ion eBike battery pack stands out as a compact, lightweight upgrade for riders converting bikes, trikes, or scooters. The single biggest reason to buy is the combination of small physical size and relatively high usable capacity, which makes it easy to mount on most frames while still supporting 250W to 800W motors. The review focuses on practical fit, range behavior, and everyday use rather than lab numbers, because the product is sold as a package with a waterproof case and fast charger.

Key Features

• Compact size: At roughly 10 by 3.94 by 3.54 in and only 4.63 lb, the pack is much smaller and lighter than lead-acid alternatives and is easy to position on the frame.
• Broad motor compatibility: The battery supports common motor power ranges and works with 250W, 350W, 500W and 800W setups, making it suitable for a range of conversions.
• Fast charger included: The XT60 connector and 54.6V 2A charger let users charge quickly and simply while following the recommended plug sequence.
• Waterproof carry bag: The included sturdy fabric pouch with double-sided waterproof zippers and adjustable straps secures the pack and fits most bikes, and it doubles as a convenient storage pocket.
• Built-in protection: A Battery Management System protects against overcharge, over-discharge, over-current, and short circuits for safer operation than unprotected lead-acid cells.

Who It's For

This battery is aimed at DIY eBike converters and riders who want a lighter, more energy-dense alternative to lead-acid packs. It is a good choice for owners of mid-drive or hub motors in the 250W to 800W range who need a compact pack that fits in a frame bag or behind a bottle cage.

Riders who need extremely long range for extended touring or who require IP-rated waterproofing for prolonged heavy rain should look at larger capacity or purpose-built waterproof systems, since the supplied bag is water resistant but not meant for long exposure in heavy downpour.

Pros & Cons

Pros

• Lightweight and space-saving dimensions make installation easy on most mountain and road bike frames.
• Users report reliable range and speed performance with common mid-drive motors, and it pairs well with Bafang-style setups.
• Includes charger and a practical waterproof-style pouch with adjustable straps for secure mounting.
• BMS protection improves safety and longevity compared with unprotected lead-acid packs.

Cons

• The pouch is water resistant but not intended for extended heavy rain, so riders should avoid prolonged wet conditions.
• No detailed runtime chart is provided, so exact range will vary with motor, rider weight, and assist level.

Specifications

Battery dimensions	10 x 3.94 x 3.54 in
Weight	4.63 lb
Cable connector	XT60
Charger	54.6V 2A fast charger included
Compatible motor power	250W to 800W
Protection	Built-in BMS: overcharge, over-discharge, over-current, short circuit

Our Verdict

The H HAILONG lithium pack is a practical, compact option for riders converting bikes or upgrading from heavy lead-acid batteries. It delivers a good balance of weight, convenience, and protective features, and the included pouch and charger make installation straightforward. For everyday commuting and moderate-range rides it represents good value, though those needing extreme weatherproofing or maximum range should consider larger dedicated packs.

Frequently Asked Questions

Will this battery fit my mountain bike frame?
The compact 10 x 3.94 x 3.54 in size and adjustable mounting straps make it compatible with most mountain and road frames, and it can be mounted in a pouch or behind a bottle cage.

Can it power a 750W mid-drive?
It is rated to work with motors up to around 800W, and customers report compatibility with common 48V 750W mid-drive setups, but runtime depends on riding conditions and assist level.

Is the bag fully waterproof?
The supplied fabric pouch with waterproof-style zippers is water resistant and will keep belongings dry in light rain, but it is not intended for prolonged exposure to heavy rain.