Batteries are single-use products. They are purchased charged and must be disposed of in an environmentally friendly manner after use.
Only buy those that do not leak even after a long time (anti leak protection).
If the batteries are lying around, their voltage can be tested with a battery tester or multimeter before use.
The alkaline battery uses a potassium hydroxide solution as the electrolyte. This means that it can store a greater amount of energy than an ordinary zinc-carbon battery.
This uses a paste made from ammonium chloride and zinc chloride as the electrolyte.
Zinc-carbon batteries are inexpensive to buy, but in terms of performance they are the clear losers against alkaline or lithium batteries.
The special feature of lithium batteries is their high energy density. Another plus is the low self-discharge, which means that they have a longer shelf life. In addition, they can withstand higher temperatures. The lithium battery uses lithium as a negative electrode. This can lead to short circuits and fire development when wet or in connection with water. Therefore always store in a dry and safe place.
Never try to charge standard, non-rechargeable batteries with a battery charger. This can cause chemicals to escape - in the worst case, the batteries can explode as a result of a gassing process!
For time-limited activities, it may be enough to go on an adventure with charged batteries or with fresh batteries. These must be transported in such a way that they cannot accidentally short-circuit and thereby discharge. Separate plastic boxes are offered for this purpose or plastic magazines into which batteries can be inserted, e.g. "Storacell Slimline".