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Old 09-01-2009, 09:23 AM   #1 (permalink)
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Question Is charging not OK with all 5v USB sources??

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I have a Datexx Ultrabattery 2200mAh Rechargeable USB Powerpack that I keep connected to the AC all the time, so if I need it I can just unplug it and go -- or use it in case of power outages which we get sometimes. I've been using it for a year or so with my prior BB, the 8830, and I'd just attach the USB to mini-USB cable nightly to use the Powerpack as a throughput charger. Always worked fine. I just switched/upgraded to the Tour but now when I attach the USB to micro-USB cable instead of charging it depletes the Tour's battery -- I mean it takes it down gradually, turns off the radio, goes to zero and shuts down. When I charge from a wall charger directly, the Tour charges just fine, so it doesn't seem to have any problem with its battery. The problem seems to be between the Powerpack and the Tour. I thought any USB powerpack could (assuming the right voltage, and we're talking 5v in all cases here) provide power to any BB. Depending on capacity you may or may not get a 100% charge, or multiple charges, but you'd get some charging. The depletion here has me wondering if there's some variation in the way powerpacks are configured so that compatability is about more than voltage and USB cables. Could there be an amperage mismatch causing some protection circuitry in the Tour to do this? I do see some powerpacks listed as being tested with the Tour on some vendor websites (e.g., the Power On The Go XP2000 Portable Charger), so maybe I just need a new powerpack, but I'd like to understand why one 5v USB powerpack would work and another would drain the battery instead. Can anyone elighten me on this?
Thanks.

Last edited by smarti03 : 09-01-2009 at 09:28 AM. Reason: typo
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Old 09-01-2009, 10:45 AM   #2 (permalink)
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Default Similar issue on a USB to PC connection (another user)

It also looks like something similar happens with some USB connections to a PC. See this post:
Battery Percentage Indicator

For me, my PC charges the Tour just fine, but I know that not all PC USB connections put out the same power, which is why some externals come with a UBS Y cord so you can connect to 2 USB outputs. I think this is/was especially common on laptops.

Anyway, the question here is: Does the Tour have some special requirements on power sources that make some 5v USB connections iffy? Since my 8830 was fine with a source that my Tour totally fails with, something seems to be different.
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Old 09-03-2009, 10:31 PM   #3 (permalink)
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Default

It seems there is some negotiation between the BB and its power source. You need to have DM installed to charge from a PC, right? I also tried a couple "generic" USB adapters in the car. One works and one doesn't. Maybe the BB needs to be "told" its okay to go ahead and pull the 500mW.

Just guesses here, but my experience seems to echo that of others.
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