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I bought a Nuvi 765T at a garage sale (device, car cradle, cigarette lighter power cord w traffic receiver). Seller knew nothing about it, so it was a gamble but at the right price. I can waterproof it with a baggie, so it should be great for the Vee.

I found the manual on line and have read through it. There is a current map update available to download. My issue is that the battery is extremely low -- so much that I don't think it will last through a map update. I want to charge the battery and would prefer to plug it into the wall to do so. It appears that the devices were never sold with a wall charger. The cigarette lighter power cord has a flat wide proprietary looking plug for plugging into the cradle. Nothing else I know of fits that plug slot.

However, the device does have a microUSB plug. On line sites for replacement batteries show the battery is 3.7v 1250mAh. My phone charger could physically fit that microUSB plug -- but I'm not sure it fits "electronically". The phone charger is 5v 2.0 amps.

Here's where I need the wisdom of the list, as my understanding of electronics is in the range of slim to none at this level. Doesn't the phone charger allow current to flow successfully through the charger to the battery as long as the battery needs are below and/or up to that point of 5v at 2.0 amps? So if the device using the phone charger wants less that 5v at 2A, all is OK with the world -- but if the device wants more, it fries the charger? Or does the charger let fly current at 5v 2.0A and thus fry anything that would want less, like a 765 battery needing only 3.74v at 1250mAh?

Anyone with a nuvi 765t know for sure that the microUSB can be used for charging the battery? I only received the 12v cigarette lighter power cord, which does not plug into the microUSB. I know the microUSB port can be used for downloading BaseCamp waypoints and routes to the 765 (successfully tested) but I'm not sure if the microUSB on this device can also be used for charging the battery.
 

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I have the Nuvi 750 and it is very close to what you have...I can charge the on board battery with the micro USB cable or when it is in the Garmin cradle it came with that I have mounted on my bike. I also have a 5v 2a USB plug / Lighter plug mounted on the bike that I can use to charge with. The device has circuitry that converts incoming power to what it needs to charge.
 

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My Garmins charge when I plug them into the computer, I think. Any USB charger should work.
I use the charger for the Kindle or whatever.
 

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Sorry so late to the party...
Your 765 should turn on when you plug it into the computer. It won't be charging as that connection has just enough juice to run the unit for Garmin Express.
If you want it to charge when you plug it in you need to turn it on first then plug it into the computer. It will take approximately forever to charge that way though. Use the brick.
The USB charger you're talking about will work fine. The 765 will reduce the voltage and only take the current it needs to charge the battery. Your phone battery is most likely also 3.7V. Most are as it is the most common voltage for the LiIon battery chemistry. It's really 4.1V or 4.2V at full charge but that goes down right away and steadies out at 3.7V for most of the useful charge.
Your battery is probably like mine and too old to hold a decent charge anyway. Mine lasts about a minute. Just enough for me to shut it off when I remove power and forget to shut it off beforehand.
 
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