I don't notice any obvious drop off, which might be because I am riding at low power for hours rather than high power for minutes, so the battery will get a chance to warm up.
The occasional let them sit in the sun, but no heating elements, charging is always indoors at my cafe and pub stops, so with one exception, always above zero.
At Kinlochewe, 6pm, already frosty, I took in the battery I had been riding on and one I hadn't. All plugged in and one charger came on, the other did not. Let the battery sit at room temperature for a while and then it was fine. Either charger or battery or both contain temperature detection and protection circuitry.
The occasional let them sit in the sun, but no heating elements, charging is always indoors at my cafe and pub stops, so with one exception, always above zero.
At Kinlochewe, 6pm, already frosty, I took in the battery I had been riding on and one I hadn't. All plugged in and one charger came on, the other did not. Let the battery sit at room temperature for a while and then it was fine. Either charger or battery or both contain temperature detection and protection circuitry.
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