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48V 20Ah Rear Rack eBike Battery

£429.00 inc VAT

SKU: BR4820B Categories: , Product ID: 4605


This 48V rear rack electric bike battery attaches behind your seat above your rear wheel. It comes with the frame

They fit most standard frames that don’t have rear suspension.


Please see the image in the product gallery above

Packaging Content

  • Battery pack
  • Frame
  • 3A Charger

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


1 year warranty based on purchase date. Please return to us for repair or replacement.

Fitting Guide

Please download the guide here.

Please note that the battery comes with XT90 terminals. They may not match the ones you have on the motor – we supply a spare XT90 connector

Additional information

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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