Yes. All batteries have an expiration date, beyond which their performance decreases.

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.

No. Condensation could cause damage to your batteries. Avoid putting batteries under extreme temperatures at all times.

The smart charge function on chargers checks the charging conditions of the batteries, the temperatures of both the batteries and the charger, etc. This allows the charger to individually charge each battery under the best conditions. This function shortens the charging time by 5% compared to the chargers without such function.

A hot battery could have several causes: from wrong storage to short circuiting. Some warmth is okay but keep an eye out for unusual heat.

Batteries are classified according to IEC classification standards: LR03 is equal to AAA, but in another standard.

Always insert batteries with the poles in the correct direction. Not doing so will lead to a short circuit.

As new energy flows into your battery, some heat is perfectly fine. If you notice the battery or charger becomes too hot to touch, cease the charging process immediately.

Make sure you measure the correct way: connect the poles to their corresponding measuring ends.

The ideal temperature for our primary batteries is between 5°C up to 45°C.