A magical battery I have never seen before - Page 1
Forum section: electronics / general

author: gamalot
author_rank: Super Contributor
timestamp: February 13, 2016, 08:53:03 am
content: The output voltage is actually negative 0.27V !!!

author: sarepairman2
author_rank: Frequent Contributor
timestamp: February 13, 2016, 09:27:51 am
content: i went back in time and had a word with ben franklin

author: gamalot
author_rank: Super Contributor
timestamp: February 13, 2016, 10:02:51 am
content: I have tested 6x GP Ultra AA size alkaline batteries which worked in my son's toy truck in series,and their results are : 1.41V, 0.94V, 1.33V, -0.27V, 1.41V. 0.92Vso I'm very curious about why their consistency is so poorHope you guys could understand my English ...

author: Muttley Snickers
author_rank: Unknown
timestamp: February 13, 2016, 10:10:44 am
content: Your display on the 1253B is missing bits I noticed....

author: gamalot
author_rank: Super Contributor
timestamp: February 13, 2016, 10:18:17 am
content: Quote from: Muttley Snickers on February 13, 2016, 10:10:44 amyes, the refresh rate is too slow I think

author: rickselectricalprojects
author_rank: Regular Contributor
timestamp: February 13, 2016, 10:21:43 am
content: With the batteriser you could...

author: PA0PBZ
author_rank: Super Contributor
timestamp: February 13, 2016, 12:11:41 pm
content: Quote from: gamalot on February 13, 2016, 10:02:51 amThe logical explanation is that the one now showing a negative voltage was inserted the wrong way around.

author: Maxlor
author_rank: Frequent Contributor
timestamp: February 13, 2016, 12:16:40 pm
content: Quote from: gamalot on February 13, 2016, 10:02:51 amI'm guessing they were at an uneven state of charge when they were put into the truck. I've seen it too, when the battery is empty yet remains in circuit, current is still being pushed through it and results in a small negative voltage. A bigger problem is that those batteries are now much more likely to leak.It happens with NiMH rechargeable cells too, and it's a bit more annoying since they're more expensive.I guess it's a good idea to stick to the recommendation of only putting batteries in series that have the same capacity and state of charge.

author: tszaboo
author_rank: Super Contributor
timestamp: February 13, 2016, 12:35:54 pm
content: It is called cell reversal. It was used in a pack, and it was weaker than the others. As current flown through it, it discharged first, and then the others forced current through it, and killed it.It is probably toast and should be safely disposed, even though maybe it still has like 50% capacity, but the self discharge could be very high, and it will do this again if you use it in a pack. Might spill, might heat up.

author: Ian.M
author_rank: Super Contributor
timestamp: February 13, 2016, 12:56:20 pm
content: Quote from: NANDBlog on February 13, 2016, 12:35:54 pm+1. So far so good.QuoteErrr . . . .WTF??? Its *NOT* a rechargable, its just dead like Monty Python's parrot!@O.P.The unloaded voltage of an Alkaline cell is an unreliable measure of remaining life. Try again with 100R across the two that read 1.41V, (or with a dedicated battery tester) and if they read >1.3V keep them for a low drain gadget. Discard/recycle the rest.

author: gamalot
author_rank: Super Contributor
timestamp: February 13, 2016, 01:31:43 pm
content: Hi guys, thanks for all the repliesI did some homework tonight, and finally I realized that 6 batteries are not connected in series into a pack, they are in 2 groups actually!!!This will explains the strange results I had got before,1. The 3 batteries in group one, they have nothing wrong, their test results are 1.41, 1.41, 1.33,2. The other 3 batteries in group two, one of them had been placed in wrong direction, their test results are 0.94, 0.92, -0.27btw, I had made another mistake, it isn't a truck, it's a excavator

author: gamalot
author_rank: Super Contributor
timestamp: February 13, 2016, 01:39:43 pm
content: here is the picture

author: tszaboo
author_rank: Super Contributor
timestamp: February 15, 2016, 11:12:27 am
content: Quote from: Ian.M on February 13, 2016, 12:56:20 pmAh, it is a primary battery? Wasn't clear from the discussion.

author: Ian.M
author_rank: Super Contributor
timestamp: February 15, 2016, 11:55:57 am
content: Quote from: NANDBlog on February 15, 2016, 11:12:27 amYour definition of 'not clear' must be rather strange:Quote from: gamalot on February 13, 2016, 10:02:51 amAlthoughRechargeable Alkaline cellsexist, theGP Ultrais not one of them. In fact all of GP's rechargable range use NiMH chemistry.

author: tszaboo
author_rank: Super Contributor
timestamp: February 15, 2016, 12:25:22 pm
content: Quote from: Ian.M on February 15, 2016, 11:55:57 amMeh. Maybe I've only read the original post. Happens.

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 16, 2016, 10:34:28 am
content: Quote from: rickselectricalprojects on February 13, 2016, 10:21:43 am800%... less?Quote from: blueskull on February 16, 2016, 09:38:44 amWas it this one?https://www.eevblog.com/forum/projects/got-2-5v-out-of-a-aaa-battery-no-batteri*er-involved/10/

author: gamalot
author_rank: Super Contributor
timestamp: February 16, 2016, 11:39:01 am
content: Quote from: blueskull on February 16, 2016, 10:43:49 amthank you very much

author: gamalot
author_rank: Super Contributor
timestamp: February 16, 2016, 11:41:09 am
content: Quote from: blueskull on February 16, 2016, 10:43:49 amhi, I am from BIG city Tieling, nice to meet you