I have the Thermic warmers with the 1300 batteries too, but with the basic control, no Bluetooth (just a push button on the battery). I only use them on low setting and I get multiple partial days out of a charge. The basic push button heat control has 3 levels of heat - - in contrast to the Bluetooth ones that do 10 levels, I think.
Check out Bobleisure for Thermic pricing - I bought two full sets of boot warmers there earlier this year, for around $300 US shipped.
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