The first LiFePO4 battery I acquired was produced by k2battery.com back in 2011. It was a drop-in replacement for the standard size 7 AH SLA battery, model K2B12V10EB. It has served me well, all these years, being the primary battery I use with my KX3 on extended trips.
I noticed that I had not recharged it for 16 months. That gave me a good opportunity to measure how much energy I put into it to bring it to full charge. The answer was 0.21 AH. So in 16 months it had lost 0.21/9.6 AH, or 2.2% of its full capacity. Granted it was sitting inside my house, not exposed to thermal extremes, but that’s amazingly low self-discharge for all those months just sitting on a shelf. (One of the MANY reasons I prefer LiFePO4 battery technology.)
In a few more months, when the battery hits a full decade, I will redo the full capacity tests that I ran all those years ago. I’d bet that it remains > 90% of its nameplate capacity.
