Inverter for truck

[DFB]

So are these stacked sub c batteries or were they just one stick...they are 4 inches long

And are sleeved in a thin kraft paper.

I don't detect any individual cell separations. :confused3:

Tell you what though I have 2 useless 18V 1833 Makita Ni Mh batteries that would definitely be worth rebuilding because I still use the saw regular. They're on the shelf too :laughing:

Maybe I will disassemble them from the case later today.





I appreciate the advice here guys.

 

[k0ua]

They are stacked sub C cells. if you cut them apart. There are also 4/5 sub c cells and 1/2 sub c cells. Sub C cells are just like C sized cells, but smaller. obviously 4/5 sub c cells are shorter and 1/2 sub c cells are shorter yet. Batteries plus can rebuild you packs if you are not comfortable doing it yourself.

 

[Soundguy]

it really depends on what is under that paper. there ARE tube batteries and other pre-sealed tube/stick batteries, especially in the 3.6v size range. Some flashlights use them shrink wrapped thay look like 3 sub c end to end, but they do have a special end on one side ( for the flashlights anyway), to contact the bolb and cap end connectors..

 

[Soundguy]

They are stacked sub C cells. if you cut them apart. There are also 4/5 sub c cells and 1/2 sub c cells. Sub C cells are just like C sized cells, but smaller. obviously 4/5 sub c cells are shorter and 1/2 sub c cells are shorter yet. Batteries plus can rebuild you packs if you are not comfortable doing it yourself.

yup, you beat me to it.

them half sub c are neat.

 

[DFB]

They are stacked sub C cells. if you cut them apart. There are also 4/5 sub c cells and 1/2 sub c cells. Sub C cells are just like C sized cells, but smaller. obviously 4/5 sub c cells are shorter and 1/2 sub c cells are shorter yet.

That they are James...3 cells 1 1/4" in length and slightly under 7/8" in dia.

 

[DFB]

So like I mentioned in my original post that the tool "smokes" when plugged into the wall charger...so with it all opened up this is the component that is overheating. (I used my IR gun to find the hot spot)




So what does this tell me

That the batteries just wont take the charge or is there something else wrong?


Good thing I got time on hands :laughing:

 

[k0ua]

So like I mentioned in my original post that the tool "smokes" when plugged into the wall charger...so with it all opened up this is the component that is overheating. (I used my IR gun to find the hot spot)


View attachment 454975

So what does this tell me

That the batteries just wont take the charge or is there something else wrong?


Good thing I got time on hands :laughing:

The photo is pretty blurry, but I think it is just a Resistor. Value unknown. I suspect you have a shorted cell or several shorted cells in the pack and the resistor is there to act as a current limiter in the normal charging function. However with shorted cells excessive current is being drawn from the charging power supply. and it has exceeded the power rating of the resistor. It could be a thermistor as well (resistance varies as it heats up) I cannot be sure. This is not a particularly good thing.

All electronic devices run on magic smoke. When you let the magic smoke out of them. they don't work very well any more. So always try to keep the smoke inside. This is electronic wisdom from a guy that has been working with electronic devices for a long time.

 

[k0ua]

Here is a little info about sub c cells.

Sub-C cell size dimensions details info type

As for the resistor, It may still be usable.. maybe not. It would be good to know its original value. Metal film resistors (which this looks like it may be) are pretty robust and will take quite a bit of abuse. A clearer photo would be good.

 

[Soundguy]

agreed, resistor or thermistor. I can't make out what it is, I work thru a phone. ;_)

 

[DFB]

Sorry about the picture clarity. Using my cell phone. No macro zoom.

I could dig out my camera if really needed

So this one probably isn't any better

There is brown(?) resistor 9 C printed on it with 2 white bands wired in between that and the neg. side of the battery pack.




That first component has nothing legible on it and looks like it has been heated up pretty good.


Makes sense what you diagnose.

The other two Makita batteries the 18v post style they just dont have any run time when they charge I don't see any excessive overheating

The smoke stays inside them