You reach into your camera bag to get a fresh battery... but which one?
Anyone who has a lot of rechargeable batteries knows what a pain in the neck it is trying to remember which batteries are charged, and which ones you've already used up. The more batteries you have, the harder it is to insure you don't grab one of the discharged batteries by mistake.
Ideally, it would be great if all rechargeable batteries had electronic power indicators, but even a low tech battery cover or case with a slider would be a huge improvement over having no indicators.
A few companies actually have rechargeable batteries with LCD or LED indicators to let you check the amount of power left in your batteries, but pretty much 99% of them don't have any indicators at all.
One easy soluti
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