Lithium ION battery problem - Page 2 - Router Forums
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post #11 of 23 (permalink) Old 10-04-2019, 06:53 AM
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In a perfect world I would like to try the batteries in a different charger. That way you could see if the problem follows the battery or the charger. I had a hitachi NiCad charger that failed. I thought the batteries were bad, but the circuit in the charger had failed, blowing fuses i after about 45 minutes of charging

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post #12 of 23 (permalink) Old 10-07-2019, 02:35 AM Thread Starter
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Hello and thanks for many answers. The brand is of high German Quality - AEG. The drill itself is not a big one, just small and handy for for drilling sessions or to screw screws. The model type is a "BS 12C".
I think my problem causes many DIY's to get feeled cheated by the large amount of advertising without anyone warning baterrypowered equipment SHOULD be used and not stored in a cellar for severals months before it gets used next time.
Yes, the price of batteries are completly out of this world. Its like all manufactures cynically wants users to buy new equipment, and this goes on and on.

I was even thinking of charging the batteries with for carcharger - but this could be a very stupid idea...
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post #13 of 23 (permalink) Old 10-07-2019, 02:41 AM Thread Starter
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Originally Posted by JOAT View Post
Yeah, batteries dying is one of the reasons I do not use battery powered tools. Except flashlights, and it's bad enough buying batteries for them. Battery powered tools have their place in the world, no doubt about it. But me, I work in, or close to, my shop. As long as a plug in is handy, no battery tools for me. I can't see any sensible reason why it would cost less to buy a new tool, with battery, then it would cost to buy just the battery. So for me it is either corded tools, or cordless that are hand operated. I'm happy with that.
I totally agree with you JOAT.
I have 2 batterypowered drills. A Bosch GSR 12v - powered with NICD - think I bought it i 2005 and this one an AEG BS12c wich I bought i (I think) 2015. The AEG is hardly been used and its a pity; when you want these tools to be operative - they both let you down cause to battery problems. I also obsevred several tool shops in my area have stopped selling cordpowered tools..
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post #14 of 23 (permalink) Old 10-07-2019, 06:51 AM
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Ms. Guillot,
As a general rule, Ni-Cad batteries are good for about 300 charge cycles(completely flat to fully charged), provided one or more of the individual cells in the battery pack do not deteriorate more rapidly. It looks like you derived good longevity from your Bosch.
The Li-ion should do better than that, but as you say, it depends on the amount of charge in the battery when stored for long periods of disuse.
Have you considered converting your Bosch for use as a “corded” drill with a car battery? Open the battery case, remove all the cells (but take care to keep the contacts in the correct position - you may have to use an epoxy resin to do so) and drill a hole in the case for the two-core wire. Solder or otherwise attach the wire to the two contacts (there may be more than two - the others are for temperature regulation or monitoring), and re-assemble the case.
Put car battery terminals on the other end of the wires - remember to observe polarity - and you will be able to use the drill for many more years, even with a weak car battery. I used one for years, until it was stolen.
And it need not be a car battery either - a smaller, sealed 12V battery will do, and you can charge it with your car charger, or even asolar charger.
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post #15 of 23 (permalink) Old 10-07-2019, 09:01 AM
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I have read about this and one battery expert says to rejuvenate take another battery of same voltage that is charged completely . The reason they fail is you have multiple cells in series and 1 or more cells are not completely charging. His suggestion is to take another battery of same voltage that is fully charged verified by your volt meter. and connect in same polarity for 15 minutes only. The old battery will get hot . No more than 15 minutes. Then put it back on normal charger. You may have to do this 3 or 4 times. The theory is as has been stated chargers are built to charge to certain level no more. A word of caution lithium battery's are dangerous .

Last edited by roofner; 10-07-2019 at 09:09 AM.
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post #16 of 23 (permalink) Old 10-13-2019, 10:54 AM Thread Starter
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Now that sounds logical - I will do so. But the question remains in tha cause: what causes the one cell to not charge fully up?
I sent both tools to a local serviceman a couple of weeks ago. I'm waiting to see if he has fixed the problem. He mentioned he had a procedure for this common problem. I will contact him and tell him about this info.
Can I , in this "scenario" use a fully charged carbattery and transfer the voltage?
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post #17 of 23 (permalink) Old 10-13-2019, 10:55 AM Thread Starter
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Now that sounds logical - I will do so. But the question remains in tha cause: what causes that one cell to not charge fully up?
I sent both tools to a local serviceman a couple of weeks ago. I'm waiting to see if he has fixed the problem. He mentioned he had a procedure for this common problem. I will contact him and tell him about this info.
Can I , in this "scenario" use a fully charged carbattery and transfer the voltage?
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post #18 of 23 (permalink) Old 10-13-2019, 11:49 AM
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One thing I like about DeWalt is that they have an upgrade device so you can use the 20v new LI batteries on the 18v tools. On my gadget, it is easy to remove the 20v battery for recharging, but very difficult to remove the adapter to use the 18 v on the tool. I kept my eyes open until DeWalt offered a "kit", which included their 4AH larger battery for a reasonable price. Don't leave the LI battery in the charger. There's a reason you can't fly with LI batteries in your checked luggage, you have to carry them aboard.

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post #19 of 23 (permalink) Old 10-13-2019, 11:50 AM
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I have tried that procedure with a NiCad battery, with limited success - it worked, but the battery capacity was significantly lower, and the effect only lasted for a couple of charges.
I used a car battery on a 12 volt battery pack. I also tried a circuit using mains electricity and a heavy duty rectifier and a current limiting resistor - cannot remember where I got the diagram. Same result as above.
I have read that the memory effect is due to the formation of dendrites (chemical filaments) in the battery electrolyte. Connecting up a charged battery theoretically “burns away” the dendrites. But after about 300 charge cycles, the individual cells deteriorate anyway. Time for a new battery.
I have not had the need, or the courage, to try it on a lithium battery. Flammability is said to be higher.
The question of why individual cells fail at different times, is a good one. Whenever I have had to replace a car battery only one of the lead-acid cells has been faulty. In the old days, it was possible to melt the compound holding the cells together, and replace an individual cell - they had metal connectors on top, connecting each cell in series with the next. But then at each service, the battery was drained, flushed and refilled. Now it is cheaper to replace the battery.
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post #20 of 23 (permalink) Old 10-13-2019, 02:48 PM
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All of the lithium ion batteries I’ve read about have electronic chips in the batteries and I think in the charger to prevent excessive discharge or charging. Lithium batteries can catch fire if they get too hot and lithium is also supposed to be highly explosive under the right conditions.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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