“It’s been a long time… How have you been?”
It’s been almost a year since I started my discharge test of the Kentli PH5 Li-ion AA battery, and the battery has lost almost 40% of its capacity due to self-discharge.
The discharge curve has gotten a lot less… linear since the last time I posted a self-discharge update. The battery is down to 62% state-of-charge, and its voltage has dropped down to 3.89 volts. Still, there’s a lot of time left until this battery reaches empty… but when?
I’m no statistician, but doing a linear extrapolation in Excel gives an approximate end date of January 2018, and the SLOPE() function in Excel gives me an average drop of 0.111%/day. Of course, this can easily change over the course of this test, but only time will tell…
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Fantastic review and very thorough! I have been interested in better batteries with less waste for a long time, and I was tempted to buy these to do the job. I really appreciate you taking the time to measure the performance and analyze the components of these batteries. Thank you so much!
Hi, I bought a set of 4 AA Kentli batteries for my digital camera as I got tired of the NMH crap self discharging even out of the camera within a week……..after 3 months of none use the charge is still there and 50 pics later it still is…….just ordered 12 AAA Kentli’s and charger for my LED torches as each takes 3 AAA dry cells that run down too quick.
lithium is the way to go and my cordless drills are all now Lithium.