This is the Elite Airsoft  7.4V 2S airsoft 20c Lipo battery pack and is a stick style.  Includes a small female Tamiya plug in an airsoft polarity and an Align style tap

All lipo packs require the use of lipo battery charger and a LVD (Low Voltage Detection device).  These devices can be purchased from us or someone else. The  LVD must be set so that an alarm is heard when the packs voltage hits a low limit of 3 volts per cell.  We CAN'T warranty lipo packs that do not use a device like this.  Proof of LVD is required for any return.  If you purchase else where you will need to provide documentation on the unit to show it is set to the correct voltage and that an audible alert tone is emitted when the low voltage limit is reached.

You can purchase a 2s and 3s device from here: http://www.eliteairsoftbatteries.com/category/66-lipo-accessories.aspx 
You can purchase a lipo capable charger here: http://www.eliteairsoftbatteries.com/category/61-chargers.aspx