Help with Li-po

[Juan David Bolaños Rojas]

Good night(at least on GMT -6), electronicspoint,

I'm currently working on a mobile Raspberry pi proyect, and, as many before me probably have, I need help with my battery choice.

A RPi 3 (my choice for device) is rated for recommended (which I'd like to achieve) power consumption at [email protected].

I would like to use a single cell 3.7v 6000mAh Li-Po battery, wich I would need to step up to [email protected] and be able to recharge the battery within the same circuit, esentially, I need a booster and charger circuit for a Li-Po. It would be really helpful if I could output the power to a micro usb cable for powering the RPi. Any insight or recommendations I could get would be really appreciated.

Thanks in advance.

 

[Audioguru]

The output power is 2.5A x 5.1V= 12.75A. A good voltage booster is 80% efficient so the total power needed is16W.
Then the 3.7V battery must provide 16W/3.7V4.32A. Then a charge will power the circuit for 6A/4.32A= 1.4 hours.
A battery power bank can charge from USB 5V and give an output of 5V.

 

[(*steve*)]

One of the most important features you need is automatic shutdown when the cell goes flat. Without that, you'll kill the battery.

You also need to consider your desired charge time and whether you want the device to operate while being charged.

 

[Audioguru]

An ordinary lithium rechargeable cell must never be allowed to discharge below 3.0V but 3.2V is safer or it will be destroyed and might catch on fire if it is charged later.