I had a question about lithium ion power packs. My company places monitors at construction site that are sometimes out at sites for months or years at a time. We have been using lead-acid batteries charged with solar panels and solar chargers to control charging to keep the monitors powered. This works pretty well, except the lead acid batteries can have some issues, and the wiring to connect to the batteries gets kind of annoying. We were thinking of using some of those lithium ion portable power packs you can get off of amazon instead, but the first few we have tried won't allow the power pack to be charging and discharging at the same time. We need to make sure that the power pack is supplying power to the monitors during the day while it is simultaneously being charged by a solar panel. I don't really know much about lithium ion batteries, so is this issue something that just happens or is there a way to work around this? Thanks.