2x AA Battery Holder with switch

The primary function of the 2x AA Battery Holder with Case and Switch is to keep cells fixed in place safely and securely while conveying power from the batteries to the device in question. External connections on battery holders are most often made by contacts either with pins, surface mount feet, soldered lugs, or via a set of wire leads. 

The AA battery holder is used for inserting cells into battery compartments. It has two nickel-plated steel coiled springs that press against the battery terminals to make electrical contact. Holding two AA cells in parallel, it delivers an output voltage of 3 V.