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Do not charge these in freezing temps.

Even going from T-shirt to sweater weather drastically changes the max C-rate if you care about longevity.

True for all LFP and 90% of li-ion chemistries also

The sellers will have no clue, do not trust their data sheets
 

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Do not make the mistake of charging these in freezing temps.
 

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Which manufacturer's models are you referring to there? Purchase links?

There are huge quality differences between the genuine Grade-A output of the top tier makers, and the non-name and/or counterfeit and/or factory reject stuff sold "cheaply" via Ali
 
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