
Using the 2 battery testers I already have, I couldn't reliably tell whether some button batteries were worth keeping or needed to be replaced. I decided to buy a different one and ordered this one. It is AMAZING. It seemed odd to put a battery in a battery tester in order for it to work, but that point aside it does a fantastic job. No matter what the household battery may be, this will accurately test it and give you a great read out to know exactly how strong it is. These might wind up in stockings this year for the holidays!

Fireproof Battery Organizer Storage Case: Waterproof & Explosionproof Safe Bag Fits 210+ Batteries - With Tester BT-168, Carrying Container Bag For AA AAA C D 9V Lithium 3V Holders
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