LiFePO4 batteries

Sefepoder 12.8v 15AHr
- Initial intention is to use this battery in a ham go-box.
- model/PN: LFP12V15A
  15Ahr $40
  amazon Jan 2025
- nom 12.8v
  15Ahr (at 0.2C ie. 3a discharge rate)
  charge voltage: 14.6 +/- 0.2V
  ie. "fully charged" = 14.6v
  charge current: 3.2A (ie. 0.2C)
  max charge current: 7.5A
  max continuous load: 15A
  max pulse load: 40A
- a single cell is 3.2v
  so this 12.8v battery has 4 cells
- some sources say you can discharge down to 2.5 v/cell
  which is 10.0v for this battery
  which is about (12.8 - 10)/12.8 = 21% discharge
  ie. "fully discharged" = 10.0v
  - Not sure if these analyses/calculations are accurate, but as a starting point...
  - 21% max discharge of a 15 Ahr battery,
    means drawing off 15 x 0.21 = 3.15 Ahr
  - If the icom is putting out 100w, using 13.8v,
    then it's drawing 100 / 13.8 = 7.2A
  - So it will last for 3.15 Ahr / 7.2 A = 0.44 hrs = 26 min
  - These calculations ignore efficiency factors, so actual time available will surely be less,
    perhaps by 85%, giving 26 x 0.85 = 22 min
  - At 50w output power, you'd have 44 min air time,
    and at 25w, 88 min.
  - These calculations are for transmitting,
    which of course is only 1/2 or less of the total time on the air.
- other sources say you can go as deep as 80% discharge without damage
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