48V 20Ah Rear Rack eBike Battery

£419.00 inc VAT

The 48V 20Ah Rear Rack eBike Battery

2 in stock (can be backordered)

The 48V 20Ah Rear Rack eBike Battery attaches behind your seat. It comes with the frame and fits most standard frames that don’t have rear suspension.


Please see the image in the product gallery above

Battery Specification 
  • On off switch
  • Key release
  • Rear Light
  • B.M.S (Battery management system) Over charge, Over discharge, Over current,  Short circuit,  Balance
  • Samsung/LG/Panasonic cells
Packaging Content
  • Battery
  • 2 x Keys
  • Rack
  • 3A 1 pin Charger with plug
  • Includes all fittings required for assembly
  • XT90 connectors and the corresponding male/female XT90 connector included
Capacity Testing

Please see the tab ‘Battery Capacity and Testing’ (above)

Important Advice
  • Do not short (join) the positive and negative wires of the battery
  • Do not reverse the polarity when connecting to the motor
  • Do not expose the battery to very high temperatures
  • Do not submerge the battery
  • Do not disassemble the battery
  • Do not use any charger unless it has been designed to charge this type of battery
  • Please consider the environment when disposing of this battery
Fitting Guide

Please download the guide here.

Weight 9.81 kg

Charging Voltage


Discharge cutoff voltage


Continuous discharge current


Max discharge current


Max charging current


Charging temperature


Usage temperature range

-20~60 °C

Battery Type

Battery Capacity and Testing

We test a sample of all of our batteries to ensure that they have the capacity we advertise, and to ensure that they will meet the demands of an ebike.  We’re probably one of the few UK based battery suppliers that actually publish discharge graphs of our batteries. The following graph shows this battery (48V 20Ah) discharge tested to 20% capacity. Fully discharging a battery can damage it so we always leave 20% of charge (your motor normally does this for you).

When we discharged by 80% (to leave 20% of charge in the battery), the capacity was measured at 16.26Ah. This means that the full capacity at 100% discharge is  20.32Ah – so it is actually slightly larger than we advertise!

Follow this link to find out more about how big your battery needs to be



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