The mini type battery is a brick design; the cells are aligned in two 4x4 lines, wrapped together making the battery exceedingly easy to put in and out of the guns. Designed primarily for front wired M4's and full-stocked guns, the 9.6v mini offers a little more current than the 8.4 equivalent - superior trigger response and quicker ROF. Manufactured by Intellect for Swiss Arms, this battery has an impressive capacity - although only 1600mAh you will be pleasantly surprised as to how long the battery lasts you (both in terms of individual use as well as overall lifespan).