Internal core unit for the MIAD®, MOE®, MOE+®, MOE-K2®, and MOE® AK Grips designed to hold two (2) AA type batteries in a self contained, water-resistant unit. Included internal spacer provides rattle-free storage of either (2) AAA or (2) N size batteries (commonly used for EOTech sights). Rubber cap has two sides with marking to identify “spent” batteries and can be opened with a push of the thumb.