AAAA batteries are much more esoteric than C or D. They’re barely thinner than a AAA battery, powering needlelike digital units, akin to some styluses, laser pointers, blood glucose meters, or transportable voice recorders. Like our different favourite NiMH batteries, our decide on this class (the EBL NiMH AAAA 400 mAh) is made to resist not less than 1,000 cost/discharge cycles, has a low self-discharge price, and operates at a voltage of 1.2 V or extra (which we confirmed in our testing). It’s rated for 400 mAh—lower than half the rated capability of our NiMH AAA picks—however it barely exceeded that estimate in our testing, averaging 418 mAh after three cost/discharge cycles and 409 mAh after 50 cycles (a mere 2% decline). In contrast, the different AAAA mannequin we examined took a 22% drop, from 422 mAh to 329 mAh, dipping under our set minimal requirement of 400 mAh.
