Upgrade your Spektrum DX9, DX8 and DX7S radio with a Turnigy Intelligent Transmitter Pack. You'll spend less time charging and more time flying because unlike NiMh, Lipo batteries hold their charge for extended periods so they're always ready to go

Lithium polymer batteries last much longer than NiMH packs as they have a far greater energy density. The Turnigy DX Series Intelligent Transmitter Pack also features a built-in voltage protection circuit, this circuit will automatically cut off once the pack drops to 2.95v per cell ensuring the battery will not be damaged if you accidentally leave your transmitter switched on. The voltage protection circuit will also restrict charging to 4.2v per cell ensuring the pack can never be overcharged.

Peace of mind charging, extended run times and Lipoly convenience like never before, Upgrade your DX8 transmitter with Intelligent Lipoly technology today!

Please make sure you change the low voltage alarm on your transmitter to suit a Lipo battery

Specs:
Capacity: 4000mAh
Voltage: 2S / 2 Cell / 7.4v
Discharge: 1C Constant 
Weight: 133g (including balance & discharge plug)
Dimensions: 71x50x19mm
Discharge Plug: Spektrum DX9/ DX8/DX7S (Compatible)
Replaces: SPMB4000LPTX