I was planning to use both keyboard and mouse via a single usb dongle, only current consumed will be by the dongle. That is why I said shouldn't be a problem.
As far as the link you posted, that is a lot of different batteries with different shapes, sizes and electrical characteristics. You must do the research and come to your own conclusions as to what you want/need.
I'm using a Li-ion battery of 7.4V (a couple of 3.7V of 2500 mAh each (actual capacity is around 1000 mAh (chinese batteries)) ) and stepping it down to 5.1V via a LM39302 voltage regulator (also tried it with a Buck converter). The only problem I'm left with is the battery protection and charging part. For charging part, I looked at the TP4056 but it is only for charging a single 3.7V battery. If I've to use 7.4V, then I must charge both the batteries in a balanced way (balanced charging) and plus I also have to implement load sharing i.e. should work even while charging.
You also need to consider how you are going to recharge. LiPo's require careful cycling and recharge control for maximum life and safety.
Thank you for that.
We can point you in a direction but we cannot, or certainly should not, engineer your project for you.
Please refer to my reply to wh7qq. USing LM39302 for regulation. Posted the battery protection circuit as well.
1. RPi 3 B : 0.5 A ideally, 0.7A avg, 1A peakGo back to your list of parts. For each one (including the Pi), work out the peak and average current it requires, and the voltage (especially for the motors).
Yeah I don't want anything to catch fire as I'm using chinese Li-ion batteries, can't trust them. Any suggestions on how to calculate the rest of the things you mentioned?The peak current will have an impact on the selection of components and wiring, so that the whole thing works safely without catching fire.
The average current allows for how much work the device does -- again, especially the motors, are they running all the time or just for a few seconds during the run.
The voltage allows us to ensure that the system can supply each part with what it needs, and also to convert the current consuption to power(W) and thus to energy(Wh), which in turn determines battery size.
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