I have many electronic devices and things like remote controls and remote sensors and the like and when the voltage is too low they will either stop working or work erratically. Stanard testers that check voltage for the batteries is not at all effective as they will only show that a battery is OK or dead and if a battery is at 60% of charge it will still show it as being OK.
I bought a ZTS pulse load battery tester and it applies a load on the battery and provides an exact reading of how much charge a battery is holding and this is for single use as well as rechargeable batteries. It is expensive but it has saved me a lot of grief when trying to diagnose a problem and I can quickly determine if the batteries are the problem and need to be replaced or something else is amiss.
With rechargeable NiMh AA batteries they will recharge faster when they can hold less of a charge. Even my Maha chargers would fail to spot a battery that was supposed to be fully recharged but actually had only 60% of its original charge capacity.
I bought a ZTS pulse load battery tester and it applies a load on the battery and provides an exact reading of how much charge a battery is holding and this is for single use as well as rechargeable batteries. It is expensive but it has saved me a lot of grief when trying to diagnose a problem and I can quickly determine if the batteries are the problem and need to be replaced or something else is amiss.
With rechargeable NiMh AA batteries they will recharge faster when they can hold less of a charge. Even my Maha chargers would fail to spot a battery that was supposed to be fully recharged but actually had only 60% of its original charge capacity.