R-eCycle battery packs made in the US by AmericanElectric.
 
The 52V Macro Shark Battery Pack Features:
52V, 20Ah, 1050W capacity
Features premium Samsung 21700 50S cells  in 14S4P configuration
High discharge, high performance 50A BMS with copper bus bar construction
DP 2170 5C polyurethane case
Lockable sliding mount
 
Not all e-bike battery packs are created equal. There are many cheaper packs available on the market. In many cases, these sellers won't disclose the battery cell type or manufacturing source. R-eCycle uses genuine Samsung, LG and Panasonic batteries because they are manufactured to higher specifications to ensure consistent performance, longevity and reliability. Our packs also use an internal honeycomb structure to securely retain the cells and maintain pack integrity.
 
Each of our packs comes with a mounting bracket to attach to the bike frame, making them easily removable. They include an integrated keyed locking mechanism, an on/off power switch and a LED battery power level indicator. A female XT90 power connector provides plug and play connection to CYC Motor kits. 
 
These packs can be ordered with or without chargers. They are charged via a 2.1mm DC charging port connector. Chargers are available in rates between 3 to 5A.
 
You can find more details on charging options here:
52V battery 3A or 4A fast charger
52V Battery 4A fast charger with aluminum case and LED status display
Grin Satiator programmable, waterproof, variable power level battery charger for 52V packs
 
The Grin Triple Bob Battery Mount (found in Accessories) is highly recommended with these packs for additional strenth and greater flexibility in mounting locations. The Triple Bob is designed to fit the DP3, DP7 & DP9 battery mounting trays.