CYC B-52L Battery Pack

The BIG 52V option from CYC.
Delivery time: No UK stock at the moment. Shipping from Hong Kong takes about 4 to 6 weeks.

This pack is BIG. When you can't chooose between maximum power and maximum range, and don't care about carrying round a few extra kilograms. 4.3kg.

Just make sure you have enough space to install it on your bike, as this is long at 36.4cm.

50E or 40T?

These samsung cells are the same size, but have different chemistry. The 50E has a larger capacity, at 4900mAh, but can only be discharged up to a limit of 29.4A (3 x 9.8A). The 40T has a much higher discharge current at 105A (3*35A which is very unlikely), so it is able to deliver maximum power and torque, but for a shorter time, due to its capacity of only 4000mAh.

So if long range is more important to you than extreme power then go for the 50E. But if you want to be able to get the maximum perfomance from your motor, then perhaps the 40T version is for you.

However, at the moment you cannot program the CYC Photon to have a greater current draw, so this choice is redudant and you should just get the 50E version. Unless (!) you are going to use the pack with a different motor, such as a Bafang BBS02 or BBSHD, or one of the X1 CYC motors that operate best with more juice.


  • Dimensions (L x W x H): 364 x 81 x 104mm


  • High impact polycarbonate battery case with cell module, BMS, & line out with XT90-S connection encased
  • Battery mount with padding pre-assembled to battery case
  • Lithium ebike battery charger
  • Velcro mounting strap
  • User Manual (ecopy)
  • Brochure