Hi all!
I have a hair trimmer which is powered by an AA NiCd rechargeable battery. Over time the battery's capacity went too low. The trimmer still works with it but only for a short time, and then the battery has to be recharged, which takes about 10 hours. This is very inconvenient, especially if one only managed to trim, say, one side of a head.
So I really need an alternative power source. I tired to use one AA NiMH battery with a capacity of 2700 mAh, but it does not work well: while the motor is powered up and rotates when blades are detached, with the blades attached it does so only occasionally, suggesting insufficient power.
The strangest part is that even after I connected in parallel four AA NiMH batteries each with capacity of 2700 mAh, they still were not able to power up the trimmer efficiently, performing only slightly better than one NiMH battery. And the old and worn-out NiCd battery still powers up the motor with the blades every time it is switched on.
Also I have a power supply which can produce 1.6 V voltage, but when I connect it to the trimmer and switch the motor on, the voltage drops to almost 0 V.
1) Can anybody explain why do four NiMH batteries connected in parallel under-perform one NiCd battery?
2) Is it possible to assemble a circuit to power up the trimmer with one NiMH battery?
3) Is it possible to power up the trimmer with a power supply?
Thank you.
I have a hair trimmer which is powered by an AA NiCd rechargeable battery. Over time the battery's capacity went too low. The trimmer still works with it but only for a short time, and then the battery has to be recharged, which takes about 10 hours. This is very inconvenient, especially if one only managed to trim, say, one side of a head.
So I really need an alternative power source. I tired to use one AA NiMH battery with a capacity of 2700 mAh, but it does not work well: while the motor is powered up and rotates when blades are detached, with the blades attached it does so only occasionally, suggesting insufficient power.
The strangest part is that even after I connected in parallel four AA NiMH batteries each with capacity of 2700 mAh, they still were not able to power up the trimmer efficiently, performing only slightly better than one NiMH battery. And the old and worn-out NiCd battery still powers up the motor with the blades every time it is switched on.
Also I have a power supply which can produce 1.6 V voltage, but when I connect it to the trimmer and switch the motor on, the voltage drops to almost 0 V.
1) Can anybody explain why do four NiMH batteries connected in parallel under-perform one NiCd battery?
2) Is it possible to assemble a circuit to power up the trimmer with one NiMH battery?
3) Is it possible to power up the trimmer with a power supply?
Thank you.