[{"element_type":"user_image","content":"https://cdn-learn.adafruit.com/user_assets/assets/000/002/234/original/LiFePO4_instructions.png?1769182241","metadata":{}},{"element_type":"text","content":"\n  \n  \n  \n  \n        \u003cp\u003eWe do have one product that supports LiFePO4 lithium batteries, which are stable at low temperatures and much much safer generally, but 3.3-3.2v over the usable range instead of 4.2-3.7v for normal lithium ion batteries, so once LiFePO4 is near flat it's too low to power the mcu. \u0026nbsp;The product we sell always boosts the voltage to 4.5volts so it's near the 5v ideal power level at all times.\u003c/p\u003e\n\u003cp\u003e\u003cbr\u003e\u0026nbsp;The device is designed for usb/solar/dc-barrel-jack power to charge the battery (and also power the downstream device/board), so uses that incoming DC power when available or the battery (boosted) if not, always outputting 4.5v for the downstream device (the load).\u003c/p\u003e\n\u003cp\u003e\u0026nbsp;\u003c/p\u003e\n\u003cp\u003e\u003cstrong\u003eMake sure to follow the learn guide, cutting one jumper and soldering another to set LiFePO4 mode.\u003c/strong\u003e\u003c/p\u003e\n      \n\n\n\n","metadata":{}},{"element_type":"product","content":"https://www.adafruit.com/product/6091","metadata":{}},{"element_type":"alert","content":"\u003cp\u003eIf supplying the charger with 12volts like I was in this test, it might overheat and occasionally reset your board, a heatsink on the charging chip or a fan \u003cem\u003e(run from load output / boards 5volt rail [pin])\u003c/em\u003e will solve that.\u003c/p\u003e","metadata":{"markdown":"If supplying the charger with 12volts like I was in this test, it might overheat and occasionally reset your board, a heatsink on the charging chip or a fan _(run from load output / boards 5volt rail [pin])_ will solve that.","alert_type":"warning","icon":"bolt"}},{"element_type":"text","content":"\n  \n  \n  \n  \n        \u003cp\u003eProduct Page:\u0026nbsp;\u003ca href=\"https://www.adafruit.com/product/6091\"\u003ehttps://www.adafruit.com/product/6091\u003c/a\u003e\u003c/p\u003e\n\u003cp\u003eLearn Guide: \u003ca href=\"https://learn.adafruit.com/adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger/pinouts\"\u003ehttps://learn.adafruit.com/adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger/pinouts\u003c/a\u003e\u003c/p\u003e\n\u003cp\u003e\u003cbr\u003eYou'd want some wire or connectors potentially to make life easier (from charger load pins to MCU board either wired as battery in / external power or as usb connector), and to have a receiver for the battery connector.\u003c/p\u003e\n\u003cp\u003eIt's maybe a bit too complex for a beginner's first go, but it's suitable as a level progression project with \u003ca href=\"https://io.adafruit.com/works-with-wippersnapper\" target=\"_blank\"\u003eWipperSnapper\u003c/a\u003e (no-code IOT firmware - written in Arduino with open-source contributors).\u0026nbsp;\u003c/p\u003e\n\u003cp\u003e\u003cbr\u003ePlus you need to \"obtain\" the LiFePO4 batteries and attach connectors if not already there.\u003c/p\u003e\n      \n\n\n\n","metadata":{}},{"element_type":"product","content":"https://www.adafruit.com/product/4714","metadata":{}},{"element_type":"faq","content":" test collapsible \n","metadata":{"markdown":"test collapsible","color":"black","icon":"question-mark","expanded":"false"}},{"element_type":"faq","content":" What about backpowering when USB is connected? (Sloppy work warning) \n","metadata":{"markdown":"What about backpowering when USB is connected? (Sloppy work warning)","color":"black","icon":"question-mark","expanded":"false"}}]