On 10/06/17 06:03, ronwirring@Safe-mail.net wrote:
About the battery. If I can find an usb power bank having the right specifications, I could then use the power bank to power the computer and if I wanted to be able to charge the battery and have the computer turned on at the same time, I could get a charger with 2 usb connectors?
With a power bank this might work, because they (AFAIK) all have their charging circuitry inside the power bank and take a straight-up voltage source to charge. It won't make too much difference how you connect them as long as you have adequate gauge wires for all connections.
If you're dealing with Li-ion cells, it's not recommended. It has to do with how Li-ion charging works. In short the charge schedule (most notable in a "fast" charge, meaning anything less than 5 hours or so) is constant current at a rate the battery can handle to voltage, and then constant voltage as the current tapers off to nearly nothing.
The upshot of this is that trying to power a device with the battery/charger combo while charging the battery will confuse any decent charger (and if it isn't a decent charger you SHOULD NOT use it). The only way around this is a charge controller designed for such use that has three sets of terminals. One for a source, one for battery, and one for load. The charge controller is then able to distinguish the load from the battery charge current and charge it intelligently.
Tor