When a rechargeable 9V battery dies, what is its behavior? Does it maintain 9V until poof, its 0. What does its curve time look like? - Quora
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Amazon.com: SZEMPTY Lithium 9V Rechargeable Batteries, 6F22 Li-ion USB 9V Battery 650mAh with 2 in 1 Type-C Charging Cable, Pack of 2 (9V USB Battery * 2) : Health & Household
![Finally! 9V battery max current tested and compared - Motors, Mechanics, Power and CNC - Arduino Forum Finally! 9V battery max current tested and compared - Motors, Mechanics, Power and CNC - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/1/4/8/148552e10f96a53af20efcefbf2caf56863cf592.png)