Search found 6 matches

by mjohnsn
Sep 25, 2009 6:54 am
Forum: Battery Technology
Topic: Dewalt 36V (one way how to repair your blown BMS)
Replies: 27
Views: 13192

Re: Dewalt 36V (one way how to repair your blown BMS)

Looks like I will have to make my own packs now. Haven't decided on 12s or 20s. Would prefer 20s, My 5305 likes the extra juice. Seems to be more charger/BMS solutions for 12s. So what do you use to charge your packs?
by mjohnsn
Sep 15, 2009 7:47 pm
Forum: Battery Technology
Topic: Dewalt 36V (one way how to repair your blown BMS)
Replies: 27
Views: 13192

Re: Dewalt 36V (one way how to repair your blown BMS)

Well! That didn't work. When I first bypassed the blown fuses the packs were almost fully charged. I discharged them about 1/2 way on a six mile run and now the charger 'rejects' them. So, now I have four dewalt batteries with blown BMS that will not take a charge. Funniest damn flashing patterns th...
by mjohnsn
Sep 08, 2009 4:52 pm
Forum: Battery Technology
Topic: Dewalt 36V (one way how to repair your blown BMS)
Replies: 27
Views: 13192

Re: Dewalt 36V (one way how to repair your blown BMS)

All packs were fully charged, I don't see why there was a "dump" from the repaired bms battery, but it sure acted like it. Is there something in the built in BMS fuse that limits current flow? So do you add diodes between both serial and parallel connections? One diode for each battery? I have two n...
by mjohnsn
Sep 06, 2009 9:27 am
Forum: Battery Technology
Topic: Dewalt 36V (one way how to repair your blown BMS)
Replies: 27
Views: 13192

Re: Dewalt 36V (one way how to repair your blown BMS)

Hey Kfong, Yes my batteries are not dioded. Isn't dioding for sets in parallel? I hooked up this 'repaired" battery and it blew the battery next to it in series, two in a set parallel to it, but didn't affect a third set in parallel. Why did it blow the battery in series and only one set in parallel...
by mjohnsn
Sep 04, 2009 9:33 pm
Forum: Battery Technology
Topic: Dewalt 36V (one way how to repair your blown BMS)
Replies: 27
Views: 13192

Re: Dewalt 36V (one way how to repair your blown BMS)

Hey Doc, Your pictures helped me repair my dewalt battery. I soldered a 15 amp mini blade fuse to the two poles of the blown BMS fuse. Battery is now recognized and charges fine. Got a problem though. I run four batteries,two batteries in series for 72 volts, then another set batteries in parallel t...
by mjohnsn
Jun 16, 2009 2:03 pm
Forum: Battery Technology
Topic: Dewalt A123 BMS battery interface solution
Replies: 121
Views: 41284

Re: Dewalt BMS battery interface solution

What are the power connectors for?