Don''t do this at home!

guido · Mar 17, 2015

Hello,

Waiting on the weather to get busy outside. Here is my latest project.

I have already smoked 1/2 of the charger cause I forgot to take them off on time GRRRRRRRRR. I have used voltage and temperature to monitor the charge process. I can also charge them individually, with my home made charger. Two of batteries I nave charged so far tested at 4.4 and 4.6. AA NIckel Metal batteries show 4 at full charge. I used Harbor Freight cheap give away meter for the testing,

Guido.

Tom in TN · Mar 17, 2015

Guido,

There are lots of things that I've never seen in my life. A NiMH battery in AA size that produces 4 volts is one of them.

Aren't little dry cells typically around 1.2 to 1.5 volts?

Hmmmm.

Tom in TN

guido · Mar 17, 2015

Hello Tom In TN.
The 4 is not voltage but is the meter testing @1.5 volts and 4,0ma. I really don't know what the meter is loading. But I know that A fully charged AA NMH battery will read 4. At 3.6 will need a recharge. Again that is not a voltage reading, but an assigned number for the battery's state of charge. That is why I posted the meter I was using many people on this site get them for free like I do,

Guido.

guido · Mar 17, 2015

Hello Tom in TN,

The cells I have in the charger are dry cells not rechargeable batteries,

Guido.

Allan in NE · Mar 17, 2015

That is physically impossible.

Allan

guido · Mar 17, 2015

Hello Allan In NE,

I know you're a good picker. Are you picking on me. Never said VOLTS HA!HA! 4 is for a charged rechargeable battery that is the volt meter test number. At 3.6 the battery would have to be charged. I'm trying to charge alkaline. I thought the picture would show that they were not rechargeable batteries but dry cells.,
Already smoked 1/2 of the charger. I don't know what will smoke next ...........stay tuned,

Guido.

MarkB_MI · Mar 17, 2015

Those look suspiciously like ALKALINE batteries. Don't do it!

Mark-Mi · Mar 17, 2015

What does a "assigned" number have to do with anything??

Clodbuster · Mar 17, 2015

Hope you have a good laugh.
I couldnt help myself.

T in NE · Mar 18, 2015

There is a charger that claims to charge alkalines. They suggest you don't do it but a dozen or so times as they become unstable. Trouble is they run back dead really fast.

1130Leo · Mar 18, 2015

I have recharged "non" rechargable batteries in the past, some work, some do not, also had some that i used multiple times. Each recharge they seem to hold a little shorter each time, until they well, not exactly explode, but rather "expand" and get a bit hot. I found out pretty quickly it was really not worth my time and the electricity used to charge them.

Guido. · Mar 19, 2015

Hello Mark- MI

Here are some pictures for you. One cell less then 1 volt with a 2.5 reading. One cell partially charged with 1.337Volts and a reading on 3.6V. Both are rechargeable batteries. The third one is a dry cell I charged with a 4.3 reading, and a voltage of 1.560. I have not tested the dry cell for capacity. A rechargeable AA battery will read 4 when fully charged. So the higher this number the higher the voltage. Voltage is just potential though, not capacity.
It took only a few minutes to bring the dry cell to that voltage, so it will probably have very little capacity. I'll know when I give it a load test,

Guido.

guido · Mar 19, 2015

Hello T in NE,

I built a charger when we raced R.C cars, we stopped doing that in 1992 or so. The charger can do up to 8 or 9 volts, I think it would do 5 amps. Here is the pack I was waiting for. NO charge. You can see the circuitry on the top.
Having replaced one set of good but not charged batteries, the circuitry is smart enough not to charge the pack. So I'll charge them individually, and bring them up to the same voltage as the rest of the pack. May be it will charge then? it is only a few months since I opened my first Lithium pack. The pack now won't power the drill. 10 cells, five sets of two paralleled cells, then in series at 18 volts.

Guido.

Don''t do this at home!

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