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NiMh rechargeable battery indication problem


NiMh and NiCd voltages change very little from 90% charge to 5% charge. The change is smaller than the difference between a new and used NiMh. The change is smaller than a cold and hot NiMh. The change is even smaller than the voltage drop across a slightly dirty battery contact. Because of all these reasons, there is no way of measuring the battery voltage and determining the remaining charge. The LED's are not a good indicator of the battery life of a NiMh. A fully charged battery can indicate red and a nearly discharged battery can indicate green, though that's rare. What the LED's can tell you is when the LEDs are off, the battery is dead. 

If the battery has the capacity to hold a full charge, then the timer is dependable. A good AA NiMh will run an SM at 100 mW for 4 hours. When the timer reaches 3 hours, it is probably time to start thinking of replacing the battery. If you must have battery life readouts and the timer is not satisfactory, then alkaline or lithium disposable batteries are your choice. You can test batteries in the transmitters by letting them run down and stop the receiver timer. This will give you a good idea of what your particular brand of batteries can do. If a battery is low capacity, discard it. It's not worth the danger of accidentally ending up in a high value situation.

Posted 1 year agoby LectroAdmin