If you are not using a storage container like the Battery Daddy that separates each battery, storing different types of batteries together, like mixing lithium and alkaline, can lead to poor performance or even leakage. It's best to store batteries by type and label your storage container so you don't accidentally mix them.
As easy as it may be to have a dedicated “battery drawer” or to store loose batteries in a plastic zipper bag together, it’s not a great idea. Batteries can easily come into contact with each other, which can cause a short circuit, or at the very least cause them to discharge and become drained.
Batteries come in many different shapes, sizes, and applications, and it can be very helpful to have several different kinds stored in your home for later use. Proper storage extends the life of the batteries and prevents them from becoming a safety hazard, and allows you to easily find them when you need them.
Avoid exposing batteries to excessively high humidity levels. Moisture can damage battery contacts and lead to corrosion, reducing their functionality and lifespan. It is advisable to store batteries in a dry environment. Some battery types, such as lead-acid batteries, emit potentially harmful gases during charging and discharging.
This is especially likely if a mixture of different sized and shaped batteries are stored in the same bag, with coin batteries easily becoming stacked or sandwiched between the poles of other batteries by mistake. The best option for loose batteries is to store them in a way that allows them to lay side-by-side.
Heat can permanently affect how much charge the battery can hold. Freezing batteries can cause corrosion. Contrary to common belief, you should NOT store batteries in the freezer. The condensation can cause the batteries to corrode and permanently ruin them.