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Two items work only 30sec then switch off.

crwdns2934249:0crwdne2934249:0:

Dear friends,
I have two B&D 20v vacuum cleaners. Both of them worked exactly 1 year and then had the same issue: work only for 15-30 seconds then are switching off. There are multiples reviews on Amazon about the same problem, thus I think it is worth to try to fix or at least find what the problems it.
+The battery pack is soldered to the controller, thus there is no easy way to replace any cell.
+
How should I start? I do have a multimeter but do not have oscilloscope…
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+[image|2470130]

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Black and Decker Pivot MAX

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open

crwdns2934241:0crwdne2934241:0 El Persizki

crwdns2947189:0crwdne2947189:0:

Two items work only 30sec then switch off.

crwdns2934249:0crwdne2934249:0:

Dear friends,

I have two B&D 20v vacuum cleaners. Both of them worked exactly 1 year and then had the same issue: work only for 15-30 seconds then  are switching off.  There are multiples reviews on Amazon about the same problem, thus I think it is worth to try to fix or at least find what the problems it.

How should I start? I  do have a multimeter but do not have oscilloscope…

crwdns2866306:0crwdne2866306:0:

Black and Decker Pivot MAX

crwdns2915684:0crwdne2915684:0:

open