I agree with Shoots. I have older quality batteries that still outperform the cheap ones. The thing with the bargain batteries is that they probably aren’t what they’re supposed to be. A lot of deception in the battery market. After all of the money we have tied up in this sport, why on earth would anyone cheap out on the power source for their optics? Especially when a quality battery can be had for $5-$10 and last a few seasons if taken care of properly.
Sanyo/Panasonic and Samsung cells have been great. NiteCores perform well too but a little pricier. Molicel is new to me but initial impressions are excellent.
I converse with a guy that builds crazy bright flashlights and has a ton of testing under his belt. His advice to me going back a few years was to never trust any battery that has the word “Fire” in its name “Trustfire” for example. Cheap protection circuits and lots of false labeling for capacities etc.