Hello all. Recently, I have regenerated some screwdriver batteries. Everything was fine until my brother needed a battery for the old Makita - a 7000 type whip. After dismantling, a problem appeared. Well, this battery (ni-cd) has a third pole, with which I have not met so far. It looks like an...

This third pole is the output from the temperature sensor (that rectangular tablet attached to the cell) without it, some chargers won't even start charging the battery.

This is a common thermistor to control the packet temperature.

Thanks. Everything is difficult until it gets simple

Well, there was a trifle - that is, the thermistor is moved but how do I understand it to connect to the third pole outside the PCM circuit?

Connect as it was - from what I remember, it should be between the ground and this additional contact.

I could not quite like it was because I replace Ni-cd li-ion and I have to install protection against discharge and overcharge mentioned BMS Protection PCB Board PCM

Will you be using the original charger or regular power supply?

It's just that you have to give a new charger with a balancer and the cells have to be high-current, eg INR18650. Why don't you regenerate the package, there are companies that do it and it does not cost expensive, starting from PLN 70. Enter makita 7000 battery on Allegro

I will just install the balancer in the battery system. 70 dych for regeneration on ni-cd with dubious 1500mah. I have a high-current (20A) samsungi for PLN 50. New 2500mah lithium-ion art. They will walk for a few years, not two or three, and it's not good ...

[Solved] Makita 7000 Screwdriver Battery Regeneration: Ni-Cd to Li-ion Conversion & Overcharge Protection

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#1 16965823 16 Jan 2018 16:56

norwidus66 norwidus66

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Post #1
16965823 16 Jan 2018 16:56

Hello all.
Recently, I have regenerated some screwdriver batteries. Everything was fine until my brother needed a battery for the old Makita - a 7000 type whip. After dismantling, a problem appeared. Well, this battery (ni-cd) has a third "pole", with which I have not met so far. It looks like an additional minus, a bit specific, on the side of the uninsulated housing of the last cell. I believe that the last cell contains an overcharging and short-circuit protection system - which results from the technical data of the battery. My problem is whether by installing a new set of two li-ion batteries (3.2v) and using PCM to derive a minus on the "third" pole"????
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#2 16965886 16 Jan 2018 17:16

bubu1769 bubu1769

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Post #2
16965886 16 Jan 2018 17:16

This third pole is the output from the temperature sensor (that rectangular tablet attached to the cell) without it, some chargers won't even start charging the battery.
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#3 16965890 16 Jan 2018 17:17

Freddy Freddy

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Post #3
16965890 16 Jan 2018 17:17

This is a common thermistor to control the packet temperature.
#4 16967896 17 Jan 2018 12:39

norwidus66 norwidus66

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Post #4
16967896 17 Jan 2018 12:39

Thanks. Everything is difficult until it gets simple
#5 16971320 18 Jan 2018 18:26

norwidus66 norwidus66

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Post #5
16971320 18 Jan 2018 18:26

Well, there was a trifle - that is, the thermistor is moved but how do I understand it to connect to the third pole outside the PCM circuit?
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#6 16971334 18 Jan 2018 18:31

Freddy Freddy

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Post #6
16971334 18 Jan 2018 18:31

Connect as it was - from what I remember, it should be between the ground and this additional contact.
#7 16971352 18 Jan 2018 18:40

norwidus66 norwidus66

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Post #7
16971352 18 Jan 2018 18:40

I could not quite like it was because I replace Ni-cd li-ion and I have to install protection against discharge and overcharge mentioned "BMS Protection PCB Board PCM"
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#8 16971366 18 Jan 2018 18:46

bubu1769 bubu1769

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Post #8
16971366 18 Jan 2018 18:46

Will you be using the original charger or regular power supply?
#9 16971367 18 Jan 2018 18:46

norwidus66 norwidus66

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Post #9
16971367 18 Jan 2018 18:46

Original
#10 16971376 18 Jan 2018 18:50

Freddy Freddy

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Post #10
16971376 18 Jan 2018 18:50

It's just that you have to give a new charger with a balancer and the cells have to be high-current, eg INR18650.
Why don't you regenerate the package, there are companies that do it and it does not cost expensive, starting from PLN 70.
Enter "makita 7000 battery" on Allegro
#11 16971386 18 Jan 2018 18:55

norwidus66 norwidus66

Level 7

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Post #11
16971386 18 Jan 2018 18:55

I will just install the balancer in the battery system. 70 dych for regeneration on ni-cd with dubious 1500mah. I have a high-current (20A) samsungi for PLN 50. New 2500mah lithium-ion art. They will walk for a few years, not two or three, and it's not good ...
#12 16971394 18 Jan 2018 18:58

Freddy Freddy

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Post #12
16971394 18 Jan 2018 18:58

norwidus66 wrote:
I have a high-current (20A) samsungi for PLN 50
INR type?
You get the normal warranty on regeneration. Anyway, how you want - your choice, your screwdriver.
If you do not give INR18650-25M cells (this M is also important), you will get a little bit and it will fall.
#13 16971402 18 Jan 2018 19:02

norwidus66 norwidus66

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Post #13
16971402 18 Jan 2018 19:02

That's exactly what I have. So how with this thermistor - directly from ground outside the balancer - right?

Moderated By Mirek Z.:
I have removed the link to the auction forbidden by the regulations. https://www.elektroda.pl/rtvforum/faq.php - p. 3.1.18.
#14 16971470 18 Jan 2018 19:32

bubu1769 bubu1769

Level 42

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Post #14
16971470 18 Jan 2018 19:32

Yes, thermistor under ground and third contact.
#15 16971484 18 Jan 2018 19:38

norwidus66 norwidus66

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Post #15
16971484 18 Jan 2018 19:38

Thanks!!! Now it's downhill - some fun with soldering, balancing the tabs and it will be OKI
#16 16971522 18 Jan 2018 19:50

Freddy Freddy

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Post #16
16971522 18 Jan 2018 19:50

norwidus66 wrote:
Thanks!!! Now it's downhill - some soldering fun
How many were originally 6, as I can see. So you give 2 lithium?
#17 16971712 18 Jan 2018 20:52

norwidus66 norwidus66

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Post #17
16971712 18 Jan 2018 20:52

It was 6 x 1.2v and I would give 2 X 3.7

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auction number on Allegro 6990907686
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Topic summary

The discussion revolves around the regeneration of a Makita 7000 screwdriver battery, specifically addressing the conversion from Ni-Cd to Li-ion technology and the integration of overcharge protection. The user encountered a unique third pole in the Ni-Cd battery, identified as a thermistor for temperature monitoring, which is crucial for the charging process. Participants provided guidance on connecting the thermistor to the new Li-ion battery setup, emphasizing the need for a Battery Management System (BMS) to prevent overcharging and discharging. Recommendations included using high-current INR18650 cells and ensuring compatibility with the original charger. The user expressed intent to install a balancer in the battery system for improved performance.
Summary generated by the language model.