What are the battery cell voltage on a 28?

i have been wanting to rebuild the battery in my 28.
What I know is that they are 18650 regular ones.
According to some website I could put a 2200 mah 6.6 ah cells but I don’t know the voltage of it so if any one knows that would be nice
Bray

 

all 18650 are the same voltage rated 3.7v and can charge to the max of 4.2v. you would need unprotected batteries. Might be much easier just to buy a new battery unless you have a spot welder to assemble them. Can be soldered but a bit dangerous. Some new batteries once the power is disconnected from the board it will never allow to charge, new Milwaukee power tools etc. i rebuilt a few for hp laptops in the past but now most are cheap enough to buy.

 

Also one thing to get past before you can recell a toughbook battery is they have a chip in them that monitors battery life. If the battery reported 50% battery life in the cell. New cell's won't get over 50%. If it reports dead 0% it won't charge the new cells at all.

Several have played with it, but I don't think anyone has had any real luck with them.

 

Is there a way to bypass this or is it non bypassable (if that’s even a word)

Anyway would these cells work or are they just pure garbage
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/293024398884

 

if those are real sony cells they would be good for battery packs for anything

in laptop batteries most of the time only a few cells fail and many are good for other things i have like flashlights. I taken the cells from many.
I did bypass with some luck on a hp battery. The battery board is a computer with firmware etc. Unless you were really sure what you are doing, I would not bother. I worried that it might damage the board and overcharge the cells. If they overcharge even .2 volts it could explode.

 

You would need some kind of reader for the chip, I don't know if the chip is even re-writable.

 

I have a eeprom reader. I use it to program simple chips and game cartridges but i am using code already made. i am sure its possible similar to reading and programming a bios.
probably easier to build an external battery that has mega capacity
or buy a new budget one for 30

 

I have a reader/burner as well i use for burning first gen OBD1 ECM/PCM chevy chips but i haven't pulled a battery out to see even what kind of chip is in there.