Can somebody please help me find the right BMS for my project?

Hello I am re-designing a battery powered screwdriver. Right now it uses a 6 Volt DC motor powered by 4 AA Alkaline Batteries in series. I am changing it to use 2 18650 Li-ion rechargeable batteries in series, and I want to recharge the batteries using a micro USB input. I am new to this kind of stuff and I need help finding the right Battery Management System to use for this. I have included images of some of the BMS that I have found. I am also wondering if I can wire a separate LED charge indicator and micro USB input to the BMS, or if I need to get a BMS that already has those installed. Any help is much appreciated, thanks!

Hi Leo-Interesting project!  I've got a feeling that none of the chargers you showed in those pictures will work, because if you want to use USB (5 volts) as a power source and you need to charge 7.4 volts worth of batteries, you've got to step the voltage up, but I don't see any inductors on those circuit boards, so there's probably not a boost circuit on them. I just did a search, and the ONLY chip I found that will meet your requirements is the Maxim 14748 chip, but it's going to be very hard to work with because it comes in a 54-bump wafer-level package. I'll try to search a bit more and see if I can come up with any other alternatives. It may be simpler to first build a boost (step-up) circuit to get up to 12 volts or so, and then use a charger chip to regulate the charging voltage and current.If you go that route you've got a lot more options, including the ones in the pictures you attached.Do you have the option of using something other than USB as a voltage source? -Rick

Thanks Rick! very helpful. So I would connect something like this to the BMS?

Also, would I be able to connect an LED indicator to the BMS or the boost circuit? or does it need to be already installed in the chip.
I was hoping I could use USB for power source because it is the most common, but if it is too much trouble, I am willing to consider another power source if it makes things much easier.

Fascinating task! I have an inclination that none of the chargers you appeared in those photos will work, in such a case that you need to utilize USB (5 volts) as a power source and you have to charge 7.4 volts worth of batteries, you must advance the voltage up, however I don't perceive any inductors on those circuit sheets, so there's most likely not a lift circuit on them. I just completed a look, and along these lines the exclusively chip I found that may meet your necessities is that the Maxim 14748 chip, yet it will be difficult to work with because of it arrives in an exceptionally 54-knock wafer-level bundle. I'll endeavor to look through more and check whether I can think of some other options. It might be less convoluted to first form a lift (venture up) circuit to initiate up to twelve volts around, and after that utilization a charger chip to direct the charging voltage what's more, current.If you go that course you've stores extra options, together with those inside the recording you snared.