About a year ago upgraded the batteries in my Uniden radio scanner from the original Ni-Cad to a lithium cell. And at the time there were several commenters (correctly) pointing out some issues. The biggest problem is that the boost circuit I used was constantly draining the battery.

So now, I'm going to upgrade my previous upgrade to a 2S configuration with balancing and other improvements.

Here is the previous video I mentioned: https://youtu.be/rMSyX-Ybc0A

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it.