====== Batteries ======

At this point I just buy and use [[wp>Eneloop]]s. Good quality rechargeable batteries. You can by them in kits with a charger to get stared. People say the Amazon Basics rechargeable batteries are rebadged Eneloops too.

Eneloops are nickel-metal hydride (Ni-MH) rather than alkaline. They have a slightly lower voltage (1.2v), but maintain this longer than alkaline retain their 1.5V. I've never encountered a device that wouldn't run on them, but it can happen.

There are black ones called pros and white regular ones. The pros keep their charge a bit longer, but can be recharged many fewer times. Regular ones are a better value for money, but you might need that longer charge for some use. When I initially researched the differences I remember it was something about one was better for using for long periods and one was better in bursts, but that didn't come up again *shrug*

===== Testing =====

There are cheap battery testers online for ~$5. Probably the best way to go, as they do a good test because they put the battery under a bit of load. Simple enough insides you can fix yourself if you need to.

You can also test with a [[multimeter]] (mine is a budget $30: [[Digitech QM1321]]):

  * As usual, have the black lead in 'COM'.
  * Put the red lead into the port with 'V'.
  * Set the dial to measure DC (⎓) voltage (V). Mine has AC and DC on the same position.
  * Touch the black probe to the negative part of the battery.
  * Touch the red probe to the positive part.
  * AA, AAA etc. cells will show 1.5V when full. 9V batteries will show 9V!

===== Reclaiming =====

  * [[yt>PsJMj7FtroY|More free street-lithium reclamation]] - Getting lithium cells out of disposable vapes.

{{tag>electronics batteries power testing recommendations guide}}