Bosch Go 3.6v Pro screwdriver repair

I bought this Blue Bosch Go screwdriver as not working. It seems to be new but does not work or accept a charge.

[@johnrutherford4042]

Glad you worked it all out and working well done

[@pederb82]

I have the pistol grip version of this one. Same happened to me after not having used it for a very long time. I left it for my apprentice to use and aparantly he was a little embarrassed to use what I call the noisy cricket. So it was left unused. I took it back and found the battery flat and “would not charge”. I opened it up and checked and the cell was discharged. I put it back together tho as I know most BMS / charging chips have a feature for low voltage cells. They bring them up extremely slow to avoid damaging the cell. I put it on the charger and it looked dead, went out on a visit to a customer and when I got back to the office it was doing the normal charge. :) So I bet yours would have done the same if you left it plugged in for a couple of hours! :) Just a tip for the next one you come across.

[@DaftOldMan]

Thanks for commenting. I did try your method without result so I was forced to open it.

[@pederb82]

@@DaftOldMan that sucks. Maybe there is a limit to how low a voltage the cell can be before it start slow charge. I’ve seen 18650’s that has gone negative too btw, have you ever come across this? And it was without there being a reverse charge. Some kind of drain in a neighbor cell in series did it. So balancing is a must in series.

[@DaftOldMan]

@@pederb82 I bought a single 18650 cell torch from China and the battery arrived 0v. It would not charge until I removed it and charged it with my DIY charger. I think the bms will often block charging if the voltage falls too low (often below 2.5v). I have heard of reverse charge in series 2S, 3S etc packs but never seen it.

[@pederb82]

@@DaftOldMan if you come across it please do discard the cell. The wise say it punch a hole through the membrane between layers of lithium and you get an internal short in the battery. That counts for 0 voltage too if you try to charge it too fast from 0. So it’s best to cheap it as slow as possible up to a safe voltage. But a reverse charged one allegedly has that issue.

[@Johadart]

Good job Dom, I’ve watched your entire video list, very good work, but the latter ones are better cause you started speaking and explaining what was happening, keep up the awesome work mate. 🤙🏼🇦🇺 Joe from Australia 🤙🏼🇦🇺

[@DaftOldMan]

Thanks Joe. I can't believe you watched all my videos. Perhaps you should get an award for that.😁

[@Johadart]

@@DaftOldMan yes and I liked them all, keep it up mate 🤙🏼🇦🇺

[@edgarcornette6387]

the charger is checking for over and under voltage on the battery.. its a protection circuit .

[@alexkay1874]

I have the dremel version of this screwdriver very handy .You may want to invest in an inline USB voltage /current meter then you can tell if it is charging . The Fnirsi is very good

[@DaftOldMan]

Thanks for comment. I just bought one from Aliexpress.

[@dennisallan3004]

I did a repair on this model not so long ago, it was swine to put back together, no space wasted, so compact. The problem on mine (actually my brothers) was the chuck, it wouldn't turn, turned out that a ballbearing had slipped out of place and was preventing the chuck from turning. Needless to say I'd completely stripped it down to the bare bones before I found the problem. Works fine now.

[@DaftOldMan]

I feel your pain. These are not easy to work on. Glad you could fix it.

[@georgedavall9449]

Sure ya did

[@dennisallan3004]

@@georgedavall9449 What's up Georgie, feel a little inferior because it's beyond your ability ?

[@georgedavall9449]

@@dennisallan3004 aww, good one there Denny old boy! Have a good one skippy 👍

[@TheEmbeddedHobbyist]

Nice looking screwdriver and a great fix. the WEEE bin must hate you 🙂

[@DaftOldMan]

Thanks. I keep trying

[@boofuls]

I know where the charger is .....its in the stable..ill get my 🧥..also I love that the fact you sound like boycie 😊

[@georgef7754]

Another proper job.

[@DaftOldMan]

Thanks. It is working well so I am pleased.

[@bunsoft2]

When you had the thing in pieces, you can plug the charger in and measure the voltage on the battery. If the charger circuit is working properly, you should see the voltage on the battery creeping up slowly ;-)

[@DaftOldMan]

That's a good idea. That would tell me if the charge circuit is working. Thank you.

[@bunsoft2]

@@DaftOldMan for me it was interesting to see the original battery having such low voltage. In case the charger/bms circuit works correctly, it should not discharge the battery lower than 2.7-2.5v. This should be the minimum alowed for a li-ion type of battery. In case you go lower, you can damage permanently the battery or significantly reduce it's lifetime. Would be nice to have a revisit of this machine a couple of weeks later. Thank you for the content and for the great videos you create for us. I enjoy each second of them. Wishing you all the best!!

[@DaftOldMan]

I made this video 5 months ago and have used the screwdriver almost every day since. It has worked fine and seems to recharge ok. Perhaps I was just lucky with this one.

[@jordancobilanschi3662]

I have that problem when i push the button won't start or starts and stop... i benched it from than. Trash model.. had it for about 1 month and gave up like that. I'm a sparky i had it for panels.

[@DaftOldMan]

I have a dyson vacuum doing the exact same thing. I think it is the electronics boards (BMS) that are not up to the job.

[@georgedavall9449]

Just Fix the damn thing!

[@DaftOldMan]

It is fixed. I use it every day.