For all kinds of gadgets (e.g., AA batteries for toys, electronic devices, clocks; AAA batteries for portable devices), we often need batteries to power them. But, old batteries that are not usable can frustrate us. The following are simple tips for saving the unused batteries for a long time.

• Do not need to keep the batteries in the refrigerator or freezer, although storing batteries in the refrigerator (or anywhere between 34–60ºF / 1–15ºC) causes minor improvements in charge capacity.
• Keep the batteries in a dry place at normal room temperature, because prolonged exposure to extreme heat or cold (below 50ºF or 10ºC) can reduce the battery life and power.
• Store the batteries in their original packaging, if possible. If batteries are loose and then create inadvertent touches with each other can drain their power since the positive and negative ends may end up touching each other.
• Separate batteries by make and age. Batteries of different types or from different manufacturers can react with each other, causing leakage or other damage.
• Check the charge levels of rechargeable batteries and then fully charge them (esp. lead acid, lithium ion) before storing them. Many rechargeable batteries will permanently damage themselves if kept in a discharged state.