Hearing Aid TIP: dead batteries bounce, fresh batteries don't. Don't have a battery tester but want to check if your battery is dead? Try this trick.... | By Back Mountain Hearing Care -
When dropped on a surface, charged and discharged batteries react differently: one bounces the other dont. Why do battery bounce differently depending on the level of charge? - Quora
![Stop bouncing your batteries — it's NOT an accurate way to measure how much charge is left - Electronic Products Stop bouncing your batteries — it's NOT an accurate way to measure how much charge is left - Electronic Products](https://www.electronicproducts.com/wp-content/uploads/power-products-batteries-and-fuel-cells-fajb-bouncing-batteries-01-mar2015.png)