EUNORAU 52V21Ah Secondary Battery for FLASH Ebike

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Go Further on Every Ride.

The EUNORAU 52V 21Ah Secondary Battery is the official high-capacity range extender for the EUNORAU FLASH e-bike series. Built with premium LG 3500 lithium cells, it adds serious distance to your FLASH — giving you the confidence to ride further without worrying about running out of power.

Key Features

• FLASH Series Specific — Genuine EUNORAU secondary battery designed exclusively for FLASH e-bikes
• High Capacity LG 3500 Cells — 52V 21Ah for maximum range extension on every charge
• Down Tube Mount — Fits neatly on the down tube for a clean, integrated look
• 500–800 Cycle Life — Long-lasting LG cells for years of reliable use
• Full BMS Protection — Short-circuit, overcharge, over-discharge, over-current, and balance protection built in

Specifications

• Model: 52V 21Ah HYFX-D LG3500 Lithium-Ion Battery
• Nominal Voltage: 52V
• Capacity: 21Ah
• Type: Down tube battery
• Weight: 13.9 lbs (6.3kg)
• Standard Charge: 4A
• Charger: 4A charger
• Cycle Life: 500–800 cycles
• Colour: Black
• BMS Protection: Short-circuit, overcharge, over-discharge, over-current, balance
• SKU: 52V-21AH-HYFX-D-RA4

Compatibility

• EUNORAU FLASH e-bike series only

Not sure if this battery fits your FLASH model? Contact us before purchasing and we'll confirm compatibility.