BOSCH Upgrade Battery / Change Old Dead Li Ion Cell / GSR BAT411

Here you can see the products which i used in this video
High Drain Lithium 18650
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Capacity Tester ZB2L3 Module
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4000mAh BAT411 Replacement Battery Compatible with Bosch 12V
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See my blog diy-tipstricks...
In this video I will show you how to open and how to increase the power of an old battery by changing the lithium ion cells.
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