The Valken 7.4v 2500mAh Nunchuck High Output 30C Li-Ion Airsoft Battery. A very small Lithium Ion nun-chuck style split pack to fit in a lot of airsoft guns. Using Japanese Sanyo cell technology, this battery is a monster.  With 30C and 2500mah, the amperage output is crazy.  Fits in standard guns and crane stocks.  Li-Ion requires no maintenance.  Does not retain memory.  Can hold energy for months before use.

***Requires a Li-Ion style charger (Most LiPo chargers also charge Li-Ion batteries, so check in advance). Charge into the JST balance plug ONLY (not in the output) with Li-Ion charger, in a safety bag only.

Each Li-Ion cell has a PCB (Protection Circuit Board) that prevents the cells from being over-charged and over-discharged during use. In addition to the chemical difference from LiPo, these Li-Ion cells boast a higher capacity than their LiPo counterparts of similar size.

Choose from either a Tamiya or Deans connector type.  If you're not sure, pick the Tamiya connection which is standard on all airsoft guns.  The Deans is an upgrade style (thick red)

Exact Dimensions: (1st stick) 68mm long x 18.75mm wide x 19.75mm thickness (where wire runs parallel); (2nd stick) 68mm x 18.75mm x 19.75mm

We tested this battery and it works with Avalon VFC, Krytac, G&G, Valken, and most other standard crane stocks.  This is a tiny battery pack, so it may also work in a lot of odd guns that fit the "mini" style packs too.

Lipo Safety Information: