Used Laptop batteries to power your esp arduino or home network UPS with 18650 cells

Using salvaged Laptop batteries I build a 12 V pack with a battery management System (BMS). The 18650 Li-ION cells from an old used laptop battery pack can be used to power 12V devices or can be used as a mini UPS (uninterruptable power supply) for devices you want to remain on in your home network such as your router (regardless if it is running OpenWRT or not ;-) )
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