Bests & Worsts Reviews from Amazon

These do not come fully charged. When I first got them I put them in a EBL two channel charger and they both charged for about 3 hours prior to cutting off. I did run a discharge test with a 117 ohm resistive load. The discharge voltage curve was basically linear from a start of 8.4 volts down to about 7 volts, that took about 8.5 hours This, to me, would be the useful life. The end of the curve was from 7 volts down to the cut off voltage of 6 volts, that part took about 20 minutes. Keep in mind, this data was taken from the very first cycle of this battery. Li-ion cells will have a slightly greater capacity after a few cycles. My test results: Resistive load of 117 ohms, start voltage 8.5 v, end voltage 7 v, average discharge current 66 ma, battery capacity measured as 560 mAh. These are made up from two Li-ion 3.7 v cells. They will never charge up to an actual 9 volts, 8.4 v is about it. If the device you are powering is OK with this voltage range (most are), then the EBL 9V Li-ion is a good replacement for a 9 v alkaline battery. I am using my batteries in a TENS/EMS unit. The unit I have works very well with these. I figure that if I use a battery 3 or 4 times, it will already have given me the same service/price of a new alkaline battery. After that, I will have 100s of uses for free. I am not going to run all of those numbers out, but a great potential for saving money exists without sacrificing anything. enjoy * Added May 4, 2014 - I did run a few more discharge tests on this one battery. The third discharge was similar to the first, except that the end of charge, from 7.0V down to cutoff at 6.0 volts lasted about 22 minutes. If I figure that energy in, the battery measures about 610 mAh. That is a good deal of energy at a predictable voltage for a battery this size. I can definitely recommend this battery. :)