![What kind of battery is this? (Blue). Thought it was just 1.2v Ni-cd, but upon measuring the voltage, it's at 3.9v. Same size as AA battery. : r/ batteries What kind of battery is this? (Blue). Thought it was just 1.2v Ni-cd, but upon measuring the voltage, it's at 3.9v. Same size as AA battery. : r/ batteries](https://i.redd.it/oj6q2vxbn7a81.jpg)
What kind of battery is this? (Blue). Thought it was just 1.2v Ni-cd, but upon measuring the voltage, it's at 3.9v. Same size as AA battery. : r/ batteries
![Global Topics on X: "Battery Size comparison - AAA | AA | 18650 | 2170 | 4680 Pic by Steven Shao https://t.co/ZQJDVhaUEx" / X Global Topics on X: "Battery Size comparison - AAA | AA | 18650 | 2170 | 4680 Pic by Steven Shao https://t.co/ZQJDVhaUEx" / X](https://pbs.twimg.com/media/EvnqPCsVEAIVC8u.jpg:large)
Global Topics on X: "Battery Size comparison - AAA | AA | 18650 | 2170 | 4680 Pic by Steven Shao https://t.co/ZQJDVhaUEx" / X
![Review] XTAR 1.5 V 4150 mWh AA batteries and L4 charger - Rechargeable Batteries - BudgetLightForum.com Review] XTAR 1.5 V 4150 mWh AA batteries and L4 charger - Rechargeable Batteries - BudgetLightForum.com](https://www.sammyshp.de/betablog/uploads/20230924_XTAR_AA_P1020625.jpg)
Review] XTAR 1.5 V 4150 mWh AA batteries and L4 charger - Rechargeable Batteries - BudgetLightForum.com
![New rechargeable lithium AA batteries tested against eneloop, one-use lithium, 9v & 18650 cells [4K] New rechargeable lithium AA batteries tested against eneloop, one-use lithium, 9v & 18650 cells [4K]](https://i.ytimg.com/vi/iUgqbtk5Rvo/mqdefault.jpg)