NiMH cells have a flatter discharge curve than alkaline cells (standard AA etc.) so measuring their terminal voltage doesn't give a good indication of their charge state unless it's done at close to maximum discharge current. As they have a relatively high self-discharge you can almost guarantee that unless they have been recently charged, they will be empty.No, you can't simply measure amp hours with a multimeter.
Testing the voltage of dry cells (AA, AAA etc.) can be done but needs a resistor to get an accurate result. Some multimeters have a battery test function on the dial.
I don't know enough about rechargeables, so I wouldn't mess about with them and I wouldn't stick meter leads in the socket. Best guide is how long it works after a full charge.
If I recall correctly there was a 1 ohm shunt designed for this, it was designed to go into the meter before the leads and created the dummy load. It could have been a 1k ohm shunt but it's been 30 years since I was taught about it and I dont recall being issued one. I do have a box of 150kohm shunts in the barn unused and out of warranty that I was supposed to use when testing after replacing a core of a cable. Never used those either I just used to mark my test certs as skipping the relevant sections due to not having the kit.I'm trying to ascertain how much life or milli amp hours (if that is the correct phrase) are left in this NiMH battery. I understand I need to put a load on it to test the resistance. Can I do it with a multimeter like the one in the photo?
Thanks in advance.
MM
View attachment 418898
Get a nail, join the positive and negative terminals together. Use the fluke to test the nail to earth.I'm trying to ascertain how much life or milli amp hours (if that is the correct phrase) are left in this NiMH battery. I understand I need to put a load on it to test the resistance. Can I do it with a multimeter like the one in the photo?
Thanks in advance.
MM
View attachment 418898
Thread starter | Similar threads | Forum | Replies | Date |
---|---|---|---|---|
![]() |
96 field battery royal artillery | Military History and Militaria | 0 | |
![]() |
LiPo Battery Question | Hardware - PCs, Consoles, Gadgets | 18 | |
![]() |
Flat battery | Cars, Bikes 'n AFVs | 23 |
Similar threads |
---|
96 field battery royal artillery |
LiPo Battery Question |
Flat battery |