I want to power a small project with 4 little and cheap dc-motors (tt Gearmotor), a Microcontroller and some sensors. Maximal current draw is 2 A, most of the time 1A. For that I want to use two 18650 Li-Ion Batteries (I still have a bunch left over from a previous project) in 2s1p configuration and now I am looking for a simple (all-in-one) solution that can provide
- undervoltage-protection during discharge
- 1-2A continuous discharge current, but more is better
- charger with current limit, individual overvoltage-protection and prevention of trickle-charging
- balancing (active if possible, at least passive)
- charging with standard 5V-USB-Charger (necessary to step up 5V for charging)
Is it really possible that there is no single board that checks all my boxes? For a single Li-Ion-Battery there is an all-in-one-solution with the TP4056 as long as your current draw isn't too high. Is there nothing comparable for a 2s configuration on the market out there?
What I've found during my research so far is that there are several single components that only meet some of my requirements and have to be combined to achieve what I'm looking for:
- undervoltage protection, but charging without current limit (5A in datasheet is too high): Battery Charge Discharge Protection Board, don't know if triggle charging is prevented...
- active balancing, but nothing else: Li-ion Active Balancer
- passive balancing, but without undervoltage protection (2,5V measured on single cell and still running): BMS Board [Balanced Version]
- USB-C charging-Board with step-up and current limit: USB-C 2S Charger
I would appreciate any advice in this regard. If there's really no one-board-solution out there what might be the best combination of boards to meet all my requirements? As I need it in an educational context, I would also prefer a cheap and simple solution, as it should not be too expensive for the students and the fewer parts we need, the easier it will be to realize. This is also the reason why I want to avoid the need for an external battery charger.
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