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I'm searching for "self heating power bank" on amazon.com and get various random crap (self heating lunch boxes, regular noname power banks, heating pad for pet
by cuu508 2y ago
I'm searching for "self heating power bank" on amazon.com and get various random crap (self heating lunch boxes, regular noname power banks, heating pad for pets...). Could you point me to some specific examples?
- lazide 2y agoSelf heating lithium iron phosphate battery [https://battlebornbatteries.com/shop/products/batteries/heated-battery-kits/?srsltid=AfmBOopQ31wtaIOsiIcFPxUrVLNMIZwz9xPrdjdwfj1KyBbIhDCyV3Dm https://battlebornbatteries.com/shop/products/batteries/heat...]
- cuu508 2y agoThanks. These are a little big (100Ah, 200Ah, 50Ah...), heavy and expensive compared to what I'm looking for. For reference, I'm currently using a 5W panel, and a single 18650 element, costing a few dollars from AliExpress. Works fine for my usecase (Meshtastic nodes) except for the charging below 0°C thing.
- wongarsu 2y agoAt that scale you are probably better off building your own solution: a low-power microcontroller with a temperature sensor, a small heating element (search "heating foil"), some voltage sensing with the ADC on the battery and solar panels, and a bit of simple logic. If you are mostly concerned with low-temperature charging you could even power all that from the charging side only.
- lazide 2y agoAt 5w, a simple temperature sensitive switch, 5w resistor, and some wraps of insulation might be enough. If below x temp, just shunt all current to the resistor, otherwise power the charger.