I just tried connecting a USB cable to my UPS (Belkin 900VA) yesterday, and it sort of seems to work. But there are two big problems: 1. When the UPS is on battery, g-p-m always thinks I have 2 minutes of battery left, and when it's on AC power, g-p-m always thinks I'm 2 minutes away from fully charged. ("2 minutes until charged (100%)"). 2. The battery percentages when discharging seem to be wrong; it's at 100% now, but if I unplug the UPS, it immediately drops to 67%, and if I wait a few minutes and then plug it back in, it immediately jumps back up to 97% or so (and back up to 100% from there). I can play around with this more later if that would help, but I don't want to accidentally run it down to empty right now.
OK, unplugged it again, and again the reported charge dropped instantly to 67%. Then it dropped slowly downward from there over the next 10 minutes or so, until it got to 26%, at which point the gauge in the g-p-m icon turned from blue to orange, and my GPS started beeping more violently. At this point I powered it off because the beeping was *really* annoying, so I don't know if it would have made it all the way down to 0.
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The "2 minutes away from charged" part is fixed in F9. The weird percentage-charged drop when it loses power is still there, but that shows up under OS X too, so I'll assume that this is actually what the UPS is reporting and there's not much g-p-m could do to work around it.