MJ-6102 is 6*18650 Li-ion celled Magicshine battery pack,7.4V 7.8Ah in capacity, default MJ-906 battery pack.
Compatible with ALL Magicshine bike lights with round shaped plug (5.6×2.1mm 1pin)
The battery is more ergonomic and straps neatly to your frame using two nylon straps
The new waterproof battery compartment design and high quality and large area silicone non-slip mat
All Magicshine batteries include a circuit with over-charge, over-discharge and short circuit protection meaning you can be sure that your Magicshine battery pack is safe to use and charge.