This is a premium INTELLECT high-quality NiMH rechargeable battery for use in most airsoft AEGs. Intellect batteries are built with top-notch quality for assured performance and are known in the airsoft and R/C hobby communities consistently as some of the highest quality, best-value batteries on the market — especially for airsoft use. Intellect battery cells go through one of the most stringent quality control processes in electronics/component manufacturing and are backed by a proprietary R&D process that enables Intellect batteries to outlast the competition and stand out as the #1 battery option for airsoft players.