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Old March 19th 18, 05:20 PM posted to rec.aviation.soaring
OHM Ω http://aviation.derosaweb.net
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Default The inadvisability of charging LiFePO4 batteries below 32F/0C(aka below freezing)

I contacted Bienno for their Lithium Iron Phosphate (LiFePO4) Battery Model BLF-1209WS and they said the following;

The operating temperature is from -20 deg C to 60 deg C (14 deg F to 140 F). Then charge between 0 deg C to 40 deg C (32 F to 104 F)