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
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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
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4.4Ah/6.6Ah are classical “SOTA” batteries
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Fine up to 10A average and 20A peak current
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Best compromise between capacity, weight and size
TX Power higher than 20 Watt or long term operations
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Less than 20Ah: Usually current limitations as 4.4Ah/6.6Ah batteries
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More or equal than 20Ah: Maximum average current up to 20Ah, Peak 40Ah