Pulse 1800mah 50C 11.1V 3S P-Tech Lipo Battery - XT60 Connector Receiver Batteries it will fit up to

it will fit up to  the largest 6 and 7 cell 5000 to 6000Mah lipos

For 550-size to 600-size helicopter with 6S config (T-Rex 550L

Support battery type and number of strings: LiFe，LiPo，LiHv，ULiHv (2~16S)

and multi-rotor applications as well

Pulse 1800mah 50C 11.1V 3S P-Tech Lipo Battery - XT60 Connector Receiver Batteries it will fit up toThe unique design of the P Tech balance connector is made with durability in mind and manufactured with the highest quality standards. P Tech enables plug and play enhancing the user experience with great convenience. Once the charger and battery are connected, the Smart P Battery will automatically recharge as soon as the charger countdown ends. It's a smart solution that's friendly and safe for batteries. Plug durability Identify battery data