Hi,
in my projects (custom PCB) I always power supply the Arduino nano through a 3.7 Lipo battery (single cell). In attachment you can find the circuit I use (the pic shows an ESP32, but it works perfectly with Nano too).
As you can see, I use a USB Lipo battery charger, as I need to charge the Lipo, without disconnecting it from the circuit. Then I use a Pololu step-up, to raise the voltage to 5V.
Now, I realise I need a 7.4 Lipo battery (2 cells), but I cannot find anyware a commercial board to substitute the charger I'm using.
To recharge the battery, I can use with no problem a standard 12V power supply with a standard jack, no need to use a USB power supply.
Thanks! Can you suggest (providing a link) some specific model? I see on google there are many different types.
Note that:
I should connect a 7.4V battery with a standard JST connector;
I would like to recharge using a standard USB (5v) OR a standard power supply (12v or 9V is ok).
Thanks for feedback.
PS: this module should be then arranged on a custom PCB.
Thanks a lot for the link, I bought the board immediately.
Please, can you provide also a minimal connection sketch?
I guess I need to connect the battery GND an +7.4v to respectively B- and B+, and use the P+ and P- as current output to power supply my PCB (i guess the output voltage will be 7.4v). Not clear where and how to connect the 12v (or 9v) power supply to the board, to recharge the battery.
The charging V's go on the P+/P- pin. I use a Vreg from the P to the Vload that can handle both the battery V and the Vcharge. I use a double connector on P. One connector is for the Vcharge and the other goes to Vload. With the double connector arrangement and the Vreg that can handle the Vcharge I can charge the batt and power the Vload at the same time.
I have an issue with that. I don't see a way to disconnect / turn-off the current draining step-up & connected board, and i doubt that the charger you are using allows for load-sharing.
Well, in the diagram is missing a switcher between the Lipo battery charger and the Pololu step up.
Does it respond to your question? I use the switcher to power on/off the pcb.
(I'm a newby in electronics!!!)
Hi,
please note that I'm a newby in electronics, and I do not know some technical terms, so I need further support (thanks a lot for his):
I'm now looking at a circuit diagram of a similar (I guess) product
Is this the correct circuit assembly?
I've a doubt: I generally use Lipo batteries (1s) with the protection circuit for overcharge/overdischarge/short circuit, like this
So, it seems to me that the board BMS manage also the balancing of the two batteries, and I'm not sure If it is safe to use two batteries like the one in the picture...or maybe this is not a problem?
Then: it is not clear to me if I can i directly connect the the "+12v-gnd" connectors of the AC/DC Adaptor to P+ P-, to recharge the batteries.
You say you use a double connector on P; could you provide a schematics?
Thanks again for support
Valerio
One last question: in the AMAZON link provided, one user asked if this board is a charger, and the response in not, it's just a protection circuit for overcharge / overdischarge and short
