Just an update on the Motorola SPN5400A:

When I first tried to use this charger with the Touchstone in several vehicles I got the charging on/off every few seconds problem.

I tried again just for yuks yesterday and the Touchstone seemed to charge the device without significant loss of battery using Pandora + Sprint Nav.

Then about 20 min into my drive it randomly started with the charging on/off dinging. I ended up just using the Touchstone as a holder and charging via the microUSB port.

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