Sorry guys, kind of new to posting. Been enjoying the forum. Many thanks to all you experts out there!!! Great posts keep it up. Larry wow you have some great ideas in the tips section. I aspire to this kind of level. Have you looked into carbide end mills? They last longer especially with plastic and wood and costs are low on smaller sizes. They're much harder so more brittle so dont try to bend or drop them.
Back to the project on hand. Sorry there's no schematics yet.
the LiPo BMS boards - they would sort of work but most will need a dedicated charge board as well. It's fine for testing and quick prototypes but I need to build something for small scale production.
these are the power sources I'm working with
1. regulated 5v (LM1117-5)
2. regulated 3.3v (LM1117-3.3)
3. Unregulated battery power for load
4. USB 5v (a little anemic at 0.5A - meaning once it's boosted to 2S charging levels we are at just over 200mA with losses - overnight at best but doable)
5. Charge voltage (9-12v) meaning more stuff like external wall warts or worse AC-DC power supply in device
No external powering required but can be achieved through USB for programming only
Was reading about lithium ceramic (and other solid state batteries) please fast forward time :0
The real problem that I think we can all benefit from is have a simple way to use, charge and maintain lithium ion batteries in our projects safely. Currently it is not a simple solution especially when you go to multiple cells.
so a simple solution to limit threshold levels, temp, balance, and charge from simple source (USB) while draining batteries while system is off is all i ask. :)