In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

I just returned from the local electronics supply and there are a lot of 3.7 lithium batteries in stock.
 

I know that they need a special charger to avoid overcharge and you need to avoid discharging below 2 volts, but they seem very attractive for running 3.3 volt -5.5 volt logic levels on the SXes.

 

After all, they are small.  They recharge quickly.  They have a lot of power in them.

 

The problem is that I couldn't find a 3.7volt charger anywhere in the store.  Do I have to import an expensive one, or is there an easy DIY approach?

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