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Thread: Other charger options?

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    Other charger options?

    Hi I wanted to see if anyone else was having any luck with auto chargers on the Vtab 1008 . It uses the standard micro usb. Are other chargers compatible with it?

    I tried the blackberry charger it shows the lighting bolt for a couple of seconds then goes off. Also didn't seem to add any charge to the battery.

    any help would be good as my daughter uses it when we travel and additional charging would be great.

    Thanks

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    Yes

    But I have forgotten the home once and that also was not good when the talent ran down.

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    Quote Originally Posted by jcdwing View Post
    Hi I wanted to see if anyone else was having any luck with auto chargers on the Vtab 1008 . It uses the standard micro usb. Are other chargers compatible with it?

    I tried the blackberry charger it shows the lighting bolt for a couple of seconds then goes off. Also didn't seem to add any charge to the battery.

    any help would be good as my daughter uses it when we travel and additional charging would be great.

    Thanks
    It's the current. All my >1.5A chargers work fine. Others charge for a few minutes and then turn off. With the tab turned off, it the lightning mark turns off but it does charge very slowly, like over night. Try www.dealextreme.com for cheap solutions. They also have cheap adapters from microUSB to the more common miniUSB.

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    I have an USB adapter lighter charger that came with another device that uses a system just like the VTAB (micro USB to USB to DC adapter) where the USB end just connects into it and it charges the VTAB fine. I picked up another like it for my daughter who travels a lot and it works fine for her tech things as well. I picked hers up at Dollar Tree for a buck!

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    I ordered a USB car charger from Monoprice for $2.50. I'll report back when I get it. I already got a microHDMI cable from them and it works fine. I've used Monoprice for years and they always seem to have the best prices on cables. It is only 500ma, but it should be enough to run the vtab in the car, but recharging, not so much.
    For only $2.30 each when QTY 50+ purchased - Car Charger (Cigarette Lighter) to USB Female Converter (500mA Output) | Car Charger Accessories

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    Vtab charger is 5V 2A.
    Any aftermarket charger producing 2A will do.
    Lesser ones might work too, but the charge will take longer.

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    Quote Originally Posted by JoelWUpchurch View Post
    I ordered a USB car charger from Monoprice for $2.50. I'll report back when I get it. I already got a microHDMI cable from them and it works fine. I've used Monoprice for years and they always seem to have the best prices on cables. It is only 500ma, but it should be enough to run the vtab in the car, but recharging, not so much.
    For only $2.30 each when QTY 50+ purchased - Car Charger (Cigarette Lighter) to USB Female Converter (500mA Output) | Car Charger Accessories
    Next time you might want to order this charger instead For only $1.46 each when QTY 50+ purchased - Micro USB Car Charger - 1000mAh | Motorola

    It outputs 1000mA.

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    I think I will next time. The built in micro-usb cable is reason enough. I can give the other one to almost anybody as a stocking stuffer.

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    High Current/Rate Car Charging

    Just my $2.02 worth.... (inflation, ya know...)

    I tested my vtab, it draws 1.7A at full charge rate. Most (well designed) chargers will current limit when you exceed their output current design limit, and the voltage will "droop" until the current stabilizes at their max. current output rating. As others have surmised, this results in a lower than desired charge rate... HOWEVER... running a charger for extended duration in an overload condition MAY result in its failure. Failures SHOULD result in a complete loss of output... however (again) NOT ALL designers are allowed to design for an intrinsically "safe failure", because it costs more to do it right (no-brand China models are often this way). SOME may even fail in a way that shorts the input voltage directly to the output... something that would result in destroying the vtab DC input circuit... a very expensive experiment.

    This "high current USB charging" all became possible due to a 2009 addition to the USB specification, quoted here from Wiki: (Wiki "USB", section 6 "Power)

    "In Battery Charging Specification, new powering modes are added to the USB specification. A host or hub Charging Downstream Port can supply a maximum of 1.5 A when communicating at low-bandwidth or full-bandwidth, a maximum of 900 mA when communicating at high-bandwidth, and as much current as the connector will safely handle when no communication is taking place; USB 2.0 standard-A connectors are rated at 1.5 A by default. A Dedicated Charging Port can supply a maximum of 1.8 A of current at 5.25 V. A portable device can draw up to 1.8 A from a Dedicated Charging Port. The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200 Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) happens if both the host/hub and devices implement the new charging specification."


    I just found this: Dual output - 1Amp and 2.1Amp... awesome... (just be sure it's the one for the iPad charging)
    Scosche-reVIVE-II-Dual-USB-Car-Charger

    Also, there are now copies from the Orient (of course there are!)... just search around for iPad car charger or "2A" car charger. Many have 2 outputs, but only allow 1 device at a time... the good brands (like Scosche) allow use of both 1A and 2A ports.

    There's even a Scosche model that has TWO 2.1Amp ports, simultaneous usage! ...and s cute little single / low-profile 2.1A model...

    NO... I'm not a Scosche employee or any such... I'm an engineer who gets excited when I find something that others have been looking for too!


    I love my VTAB!
    rprr and Ken401 thanked this.


 
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