A battery is a chemical product which produces electricity by chemical reactions at its inside. These reactions and its inside materials do deteriorate over time. If you start using it within that period, the battery will operate normally and maintain the specified performance.

You’re always allowed to board the plane with your hearing aid batteries in the device. For regulations on bringing spare hearing aid batteries, please consider contacting your airline.

Don’t charge an alkaline or zinc-carbon battery, they are not designed to be charged.

Never charge Ni-MH batteries with a Ni-Cd charger. There are significant differences in charging conditions between those two types of batteries.

You’re always allowed to board the plane with your hearing aid batteries in the device. For regulations on bringing spare hearing aid batteries, please consider contacting your airline.

Battery leakage is caused by forcefully discharging, short-circuiting, or the safety valve releasing excess gas from inside the cell.

Mixing batteries causes an imbalance in the energy flow. Some batteries will overcompensate this by discharging faster than usual - greatly reducing their lifespan.

There are some best cases to keep stored batteries in best shape: store them in their original packaging, never mix up different batteries and store them at room temperature or in a cool environment.

Shelf life varies from product to product.

Batteries are chemical products which internally undergo certain chemical processes over time. Due to this process some batteries slightly discharge during storage.