I purchased my first LiFePO4 battery a decade ago from a company called K2 Energy (still in business today). It was the same size as a 7 AH Lead Acid battery, but 1/3 the weight with a 9.6 AH rating. It quickly became obvious to me that this was an outstanding battery technology for ham radio use (voltage above 12.0 volts for more than 90% of the battery capacity, and thousands of charge-discharge cycles of life).
After ten years of use, with hundreds of charge-discharge cycles under its belt, it still has 8.8 AH tested capacity (92% of its original 9.6 AH capacity). This was based on a constant current C/5 discharge (1.92 Amps). Under those conditions the battery remained above 12 volts output for 96% of its capacity, and had a total run time of 4 hours and 35 minutes.
BOTTOM LINE: LiFePO4 batteries, from a credible vendor, will serve well for more than a decade!
