What should I look at when charging?

A few practical tips:

  • Never charge primary batteries. They will become hot and can leak or even explode.
  • Rechargeable batteries must be fully charged the first time, because they are supplied uncharged by the manufacturer. Recharging the batteries for the first time will always take longer then normally and should preferably be done in a slow way (don’t charge the batteries fast).
  • Don’t charge the batteries in a cool environment (below 0 °C). However, once recharged the batteries can be used excellent in an environment with low temperatures.
  • Make sure the batteries are fully charged for the first time. Don’t take them out of the charger halfway the charging process; this has a negative effect on the batteries. To prolong the life on a battery, it is also important to electronic discharge it prior to recharging the battery again. The first time, or after prolonged rest, it may happen that the battery is not fully charged and will not reach the desired capacity. In this situation it is advised to fully discharge the battery and recharge it once again.
  • It is often desirable that NiMH batteries are fully charged within 1 to 2 hours. Given the composition of NiMH batteries, fast charging is not recommended within this amount of time. Chargers made specifically for these NiMH cells need at least 3 to 4 hours to fully recharge these batteries.
  • After the charging process, the charger should be able to switch to trickle charge. This ensures batteries stay fully charged when staying put for several days/weeks in the charger. The self-discharge is then offset by the extra energy the charger generates.
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