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Electrical Applications | Basic Power Analysis | Accessories | PSU | UPS evaluation | Battery analysis | CCTV camera system troubleshooting > Power supply / Battery Chargers
BOSCH Ni-Cd 12V How should the battery terminals be connected?
Gianluca:
Hello everyone, I have an old Bosch screwdriver from the 2000s. I found this battery in the house but it was disassembled and who knows where the pieces went. Now, assuming that it is impossible to buy (maybe I'm wrong?) only the piece of photo A, I have reconstructed the contacts (photo B).
I connected the contacts D and C together by inserting the temperature sensor but the charger does not charge. I am wrong, I remember when I disassembled the battery (10 years ago) that there was a small resistance inside ...
Thanks to those who can help me and thanks also to the administrator for accepting me in the forum. :)
Kiriakos GR:
Hi,
Use alcohol all over the hot-glue (make it wet) and carefully remove it by breaking it in pieces with small screwdriver.
Now extract entire connector and plates from the plastic body (battery housing).
This should look like as is in my picture.
Gianluca:
Hello,
thanks for your answer, however, I no longer have the original connector that you showed me in this photo ... Unfortunately it was lost, I rebuilt the contacts and glued with hot glue. My only problem is understanding how to connect this sensor. I see resistance ... What value does it have? Where should it be connected? Thanks :)
Kiriakos GR:
The resistance this is connected at minus and to key tag = Genuine Bosch battery.
The sensor get connected at minus and front battery tag.
The resistance this is precision type, use this link to verify the bands and accuracy.
You have to use identical in specifications resistance or else the charger will reject the battery.
https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-5-band
Kiriakos GR:
For personal use I have a modified battery box this converted to battery simulator .. I can test any Bosch charger if this is working properly, and I can data log the charging process too.
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