Very Good Idea
February 18, 2015
I may design my next product to use this battery. The protection circuit works well, preventing discharge below 2.5 volts or so, which saves the battery. (Once a lithium ion cell is discharged completely it loses its capacity and goes way out of spec.)
**HOWEVER**: I would rate this battery as 400 mAh, not at 600mAh as they claim. Maybe, if you discharge this thing at a 1 ma rate it would hold up for 600 hours, but I discharged it at a 400 ma rate, which is only 1.25 watt or so, a reasonable loading for real-world use. It gave me one hour at 400 ma.
400 mAh is very useful, no problem. I never believed 600 mAh anyway, the battery is too small to deliver such power. But it would be nice to see an honest, conservative specification that really meant something. This hypy specmanship makes me wonder about the quality I might expect within a batch of 1000 of these.
(Note the battery is about 2mm longer than a standard AAAA. This means it will not always fit where an AAAA fits.)
Pros:Safer and more reliable Li Ion battery because it has an integrated protection circuit. All Li Ion batteries should be made this way.
Cons:Inflated power specification. It's really about 400 mAh, not 600 mAh. I tested 2 batteries, charging first with their small charger and also with an advanced Li Ion charger that follows the perfect 3 step charging process. Discharge via precision current source. i performed the test several times on both batteries. The results were consistent, which is GOOD. The ampacity was really 400 mAh, not 600 mAh.