Charge voltage is affected by current, time and temperature in the same way as Ni-Cd batteries. Raising the charge current, or low ambient temperatures will result in the charge voltage rising. The charge efficiency also varies according to current, time and temperature, with charge efficiency decreasing as the temperature increases.

The discharge voltage is almost the same as that of Ni-Cd batteries at 1.2V. The discharge capacity is over twice that of Ni-Cd batteries (N Type). Additionally, as with Ni-Cd batteries, the discharge characteristics of nickel-metal hydride batteries are affected by discharge current, temperature, etc. Discharge voltage and discharge efficiency decrease as the current increases and the temperature decreases.

The cycle life varies according to charge and discharge conditions in addition to conditions of use such as temperature. It is possible to obtain maximum performance if the battery and charge-discharge conditions are suited to the device and environment in which it is used. Also, as shown in the diagram to the right, when used in accordance with JIS and IEC charge and discharge specifications, a service life of over 500 charge/discharge cycles is possible.

When batteries are stored in a charged state, their capacity gradually decreases. This is known as "self-discharge". Self-discharge is greater at high ambient temperatures, but the capacity can be restored by charging the battery. Furthermore, even when stored for an extended length of time without charging, if the storage conditions are appropriate, the capacity can be restored by repeated charge and discharge in the same way as for "self-discharge".

Stable characteristics can be obtained from low to high temperatures.

Abnormal use including overcharging, short-circuits and reverse charging may result in increased pressure within the battery causing a number of problems including rupturing. Although the battery is designed to be safe in cases such as this, with a safety valve operating to prevent this occurring, please carefully read the safety instructions.