Dewalt Battery Cell Voltage Test ⚡

How to test a dewalt battery and identify a bad cell. This video shows how to test the voltage on individual cells in a dewalt Xr 18v or 20v max battery. This video is a follow up to a previous video I posted of how to repair a battery that is not charging. That video showed a method of jump starting a battery that had been sitting discharged for too long. This video shows the next step if the jump start doesn't work.
The cell test is carried out using a volt meter the good cells were showing about 3.7 to 3.9 volts.The bad cells in this case two in number showed roughly 2.4 v and 1.6v. These cells drop the overall voltage of the battery too low for the charger to recognise it as a flat battery. Replacing the cells after the jump start method is attempted seems to be the natural course of action.

[@PT4LifeYO]

Each set 2 cells is in parallel. So you are actually testing 2 cells each time.
You need to split them to test individually.

[@doctorlefthandthread]

I usually replace the 2 even when you pull them out the 2 cells are usually low

[@martinkelly2171]

Great video

[@vvslavavv]

There is a pair of batteries connected in parallel in this battery pack; you don't need to measure every battery .. you just need to measure every pair.

[@doctorlefthandthread]

That's right this is an older video

[@cossiejay1]

unless they are seperated will you not get a reading from the other cells

[@doctorlefthandthread]

Please correct me if I misunderstanding your comment but I find I can test the individual cells when they are connected. I just put the positive and negative probes from the voltage meter on the opposite ends of the cell I wish to test.

[@davidfarmer2049]

Yes they will. IIUC you are right. the video is wrong.

[@davidfarmer2049]

@@doctorlefthandthread unless they are separated will you not get a reading from the other cells" yes you will , IMHO this video should be pulled as misleading

[@IMPACT-NATION]

I have faith in you brother. You have the talent for sure. You just need the confidence. Get those cells soldered man!😎👍✊

[@doctorlefthandthread]

Thanks man!

[@itsarlynbitch]

thanks for this video. i was worried measuring an array that was still connected in series would either give me a reading of the combined cells and/or an equivalently powerful, possibly fatal shock. :)

[@CbrF4i600cc]

Lol I have dewalt knock off battery, and they forgot to add batteries in the bottom row

[@doctorlefthandthread]

Lol you probably only ended up with a 2ah the knock offs are horrendous
th-cam.com/video/KVlWLyMhUyQ/w-d-xo.html

[@davidfarmer2049]

"unless they are separated will you not get a reading from the other cells" yes you will , this video should be pulled as misleading

[@bryanthompson2588]

I checked on the is faulty myself without separating the cells and some do read lower than others and it is easy to find those that were bad,, hardest part is separating them…..