Charging batteries via a 5v USB connection
I am working on a project that requires 4 AA batteries. I would like to discuss if it is possible to create a charger that would charge the batteries (rechargeable AA's of course) via a 5V USB cable.
The unit itself would not need to use the 5V USB power to operate, just to recharge the batteries when not in use.
Does anybody know if this is possible? Please let me know if this a vague question, as I am in no means a professional in this area.
Thanks in advance to any insightful comments!