My device has some loads which use 5V. I can't use a single Li-ion Battery as it'll give only 3.7V. So I've decided to connect the batteries in series to get 7.4V power supply. Since my wall adapter gives 12V output, I'm planning to use MCP73213 to charge the batteries. The batteries I've bought are actually cell phone batteries.
Now I've the following questions:
- Is it a good idea to use this cellphone batteries in series? Is there any possibility that this series connection will affect the battery life?
- Is MCP73213 a good choice, as it doesn't have any balance charging mechanism?