RESPECT POLARITY! Make sure to insert the batteries properly, following the symbols showing you the correct way to position the positive (+) and negative (-) ends of the batteries. Many cases with heating or leaking batteries find their origin in wrong polarity.
- Batteries are best stored in a cool, dry place at normal room temperature. Remove batteries from devices that will be stored for extended periods.(> 6 weeks)
- Don't dispose of batteries in a fire—they may rupture or leak.
- Don't carry loose batteries in a pocket or purse with metal objects like coins, paper clips, etc. This will increase the risk to short-circuit the battery, generating high heat, internal pressure and eventually leakage.
- Don't recharge a battery unless it is specifically marked "rechargeable." Attempting to recharge a normal battery could result in rupture or leakage.
- Don't put batteries or battery-powered devices in hot places—elevated temperatures increase the self-discharge of batteries.
- Don't mix old and new batteries, or mix different types or makes of batteries. This can cause rupture or leakage.
- Don't give batteries to young children.
Special care for Rechargeable Batteries
Regular rechargeable batteries spontaneously lose their charge over time, by a phenomenon generally known as “self discharge”. After about 3 months of storage this kind of rechargeable Ni-cad and/or Ni-MH batteries will be close to having no charge anymore and should be charged again before using them. Nowadays many brands, including Panasonic, have in their portfolio a new type of Ni-MH batteries that stores the energy in a much more efficient way, having still around 85% of the charged capacity after 1 year or longer. This makes it much more easy to use rechargeable batteries also for appliances where the batteries usually last several months like remote controls or clocks. Of course, for devices related to safety such as smoke detectors or safety torches, it’s still not a good idea and primary batteries should be recommended.
- The rechargeable Nickel Cadmium batteries suffer from so-called 'memory loss'. If they are recharged before they are completely empty, recharging is only partial. As a result this lower capacity becomes the new maximum capacity. The rechargeable nickel metal hydride batteries (Ni-MH) do not suffer from this effect. Nickel Cadmium batteries have been banned from the consumer market since the last years and should also disappear from our homes in a couple of years.
- Don't leave your rechargeable batteries discharged or unused for extended periods of time. To keep batteries fresh, charge them at least every 6-9 months. Remember to recharge your battery a few hours before you want to use them. (unless your have the low self discharge type).
- Batteries get warm during charging and use – this is normal. As a precaution, Panasonic batteries and chargers are designed to protect against overheating. For longer life, charge your battery at room temperature.
- Keep battery contact surfaces clean by gently rubbing with a clean pencil eraser or cloth. Rubbing alcohol helps clear dirt and residue. Dirty contact points are a primary source of charging problems.
- Avoid any risk of short circuit (through damaged labels for example) because rechargeable batteries have a very low internal resistance which can lead to very high temperatures in case of short circuit.