nuvi 760 Always Has a Low Battery

Try letting it run all the way down and then charge it. A friend had the same problem untill he did that.

Have you checked the voltage at the socket in the car?

Depending on the type of car charger cord you have, sometimes the plastic tip, which unscrews, works loose or completely falls off. Also, when you unscrew the tip, there should be a fuse in there. Check the fuse to make sure it is there and also not blown.

If the power in the socket goes OFF when you turn off the car but the GPS stays ON, it might run the battery down over time.

Do a complete discharge/recharge and check the socket and cords. I suspect one or the other will produce a reason for your observed problem and a solution for it.

Do you ever turn off the 760 using the switch while still plugged into the lighter in the car? If so, JackJ180 has discovered that his 750 doesn't really turn off. So, when you eventually turn off the power, it continues to run until the battery is totally discharged. I suspect the same is true when you use an AC adapter inside your house. I was dubious until I tested my own 660.

Some comments:

I bought the unit new and have only had it for about 6 weeks. When I take it out of the cradle it asks if I want to turn it off and I always say yes. The battery always says it is low so I effectively run it down completely every time I use it.

I brought it into the house and used my AC adapter to charge it. I did it a few times and even changed outlets to eliminate the possibility of a bad outlet in the car and a bad outlet in the house.

It now says it has a charge but I have no doubt that after a few hours of use in the car it will be low again.

Sounds like a defective car charger?

Interesting, does this also cause the random and strange situations where the Nuvi 750/760 seemingly won't turn on?

I have the problem with the car charger and the house A/C charger. The house charger eventually works but only after many hours of charging. I haven't been in the car for a 12 hour drive to see if that eventually works.

If it was totally discharged, it might not start up until the battery has a slight charge.

You didn't answer my question as to whether you turn off the unit with the switch before turning off the car.

Yes I do.

I called Garmin today. They said the unit is defective and I am returning it for a new replacement.

If you turn off the unit with the switch while power is still being supplied to the unit, the screen goes blank, but the internal circuitry stays on -- even when you unplug it. Thus, you are running the battery down. Your unit is probably not defective at all. You can find other threads on this behavior.

I had exactly the same problem with my 760 and I am very diligent when it comes to charging batteries. Running them down all the way and charging them all the way.
I returned it to Garmin and ended up getting a 770. Have not had an issue with it. Maybe you got my old one! lol

Time for a new battery

Considering previous post was 02/16/2009 (13 years ago), I'd say they've probably figured something out by now.

Probably an old battery.