What is a Hailong ebike battery?

The HL (Hailong) is a battery which is mounted within the bike frame, normally attached to the bottle holder bolt holes which are present on most frames. The battery is normally encased in a plastic or composite case to protect it.

These batteries generally come in the following voltages: 36V, 48V and 52V. Larger size batteries are currently unlikely due to the limited size of a Hailong battery as it must fit inside a standard bike frame.

The Hailong battery is sometimes referred to as a Dolphin or a Shark battery.