Board Thread:General Nerf discussion/@comment-45439975-20200410000856/@comment-27306930-20200411030500

Excellent questions. Dead alkaline batteries make terrible dummy batteries. The have high electrical resistance, plus they tend to leak when they're dead. Don't use them.

LiPos are much more complicated than regular batteries. Unless you are ready to learn how to properly handle, charge, and store LiPo batteries, I would stay away from them.

Before I can recommend specific IMRs, I need to know what country you live in. Not all batteries are available in every country.