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https://hobbyking.com/en_us/hobbykingtm-cell-checker-with-low-voltage-alarm-2s-8s.html
Hobby Charger
Used to debug and charge Litium batteries. iCharger looks to be a good brand, and a decent cost. The 1010B(+) can do up to 10 batteries in series. The 106 can do 6. I think you get the idea of how the model name works into this....