On LiFePo4 Batteries
A good hamradio LiFePo4 battery should be able to offer 12V and a peak current drain up to 10A.
For easy recharging (USB PD, Solar, lab power supply) the BMS must be able to handle a big range of voltage: 12-30V.
They should be lightweight and affordable.
My primary sources for rechargeable batteries are
EREMIT - Best wide range BMS that is able to handle voltages up to 30V. Directly chargeable using a solar planel without additional circuits!
When working when high transmission powers (>20 Watt) maximum discharge current limits the minimum battery size.
Rules of thub for battery selection
TX Power up to 20 Watts
4.4Ah/6.6Ah are classical “SOTA” batteries
Fine up to 10A average and 20A peak current
Best compromise between capacity, weight and size
TX Power higher than 20 Watt or long term operations
Less than 20Ah: Usually current limitations as 4.4Ah/6.6Ah batteries
More or equal than 20Ah: Maximum average current up to 20Ah, Peak 40Ah