These are Lipo battery packs or LiFe battery packs for airsoft guns.
All lipo packs require the use of a LVD (Low Voltage Detection device). This device can be purchased from us or someone else. It 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
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Choose me if you cannot find an airsoft pack for your gun.