How to make a 9v battery pack rechargeable at home using 18650 cells in series to replace the 9 volt alkaline battery at home.
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In the same way, you can make a small 12v battery in this video
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How to make 9v battery pack the instructable tutorial
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You have to understand that these 18650 batteries are different from the lead acid and the charging/discharging process is totally different from a normal lead-acid 12v battery .
If you need a 9v battery and want to learn how .to make it from 18650 cell watch the video it has details on how to make a new battery at home.You can make this battery from 18650 cell that can be harvested from laptop batteries or power banks, a thing that has Li-ion in it can be reused and reconfigured in a homemade battery.
The important steps when making a 9v battery:
Charging the cells
Discharging and see the mAh of each battery
Match them to closed capacity
Make your battery pack by series or parallel connection.
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