Attached from a battery (4 x AA NiMH - it would be nice to add a 5V regulator) a standard USB power/data cable causes the GARMIN NUVI 205W GPS to go into USB MASS STORAGE MODE (for data transfer) just as if it was attached to a computer. The commercial car charger through the same mini-usb port allows the unit to work in navigate mode. How can I modify the cable so that the NUVI sees it as power only?
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You can see if the wire is made corresponding to the USB 1.x/2.0 standard. (All USB cables should follow the standard, but many manufacturers don't respect this and use whatever cables they get cheap.)
The Pin-out and wire colors can be found here: USB Wikipedia the free encyclopedia
(scroll down to "Pinouts", also provided below)
USB 1.x/2.0 standard pinout
1 VBUS Red (or orange) +5V
2 White (or gold) Data?
3 Green Data+
4 GNDBlack (or blue) Ground
Yes, there can be a problem doing this. First off, 3 AA batteries does not equal 4.2 volts, they are 1.2volt nominal so 3 * 1.2 = 3.6volts. When they are just off the charger, terminal voltage will be closer to 1.5v, so 1.5*3 = 4.5 volts.
Using ohms law, E=I * R, we can find your current as I = E / R or I = 4.5v / 4r7 as .95Amps (almost a full amp) that you would see worst case. The resistor is doing nothing for you.
The reason that the charge light blinks intermittently is because the charge controller (lithium battery, right?) is pulsing due to low voltage.
Try this: Take *6*, yes, 6, AA batteries, your choice of chemistry, and put them in series. That will give you a nominal (alkaline) voltage of 9v. Connect a low dropout 5v regulator such as an LT1117-5. Then you will be able to use your battery backup much more effectively.
On a different note, I used 4xAA (NiMH) and powered my ipaq 3650 directly. Worked great. Your mileage may vary though.
Battery Life: Good battery life for a camera running from two AA cells. The
Nikon Coolpix 4600 uses two AA batteries for power, but its lack of a
standard external power terminal prevented me from conducting my
standard power measurements. It does seem to have pretty good battery
life, particularly if you run it from high-capacity rechargeable NiMH
on my charger the red lights are only to tell there is power connecting especially when you have two battery's behind each other on the bottom of my charger there is a guide as to how long you should charge each battery as to size which are aaa 7hours max aa 24hours c 24hours d 24hours 9v 24hours hope this helps glenn............
Your camera requires four AA size batteries. There are several factors that contribute to battery life:
NiMH: This is the best solution for enjoyment and cost savings. NiMH batteries typically last longer per charge than the average alkaline batteries. NiMH batteries are rechargeable batteries, so they can be used several times and thereby reduce the expense of continually purchasing new batteries. NiMH batteries are typically sold with a power adapter for charging. The life of these batteries can often be determined by the mAh rating, the higher the mAh rating on the battery, the longer that they will last. NiMH batteries do not have the memory effect associated with NiCd batteries, which means that these batteries can be recharged at any time and at your convenience (you do not have to wait for the batteries to completely drain between charges).
Lithium: Energizer has introduced a new series of Lithium batteries that provide optimum performance and long life for disposable AA size batteries. Laboratory studies shows that Lithium batteries last more than three times as long as standard Alkaline batteries. This means more hours of fun and satisfaction with your digital camera. These lithium batteries are not rechargeable, they are long lasting.
Alkaline: Using the Display, downloading images, playback, zoom and flash all require some battery power to operate and may decrease the number of shots per set of batteries. Performance may vary based on the Alkaline batteries selected. The benefit of being able to use alkaline batteries is that you can find then almost anywhere if needed.
Manganese: If you are using manganese batteries, the typical battery life will be about 2 - 5 shots. Then the camera will indicate that battery power is low and may shut-down. To avoid this experience, use either Alkaline or NiMH batteries.
Optimum Solution: Use a set of NiMH batteries for longer use and to reduce the expense of continually buying new batteries. It may also be a good idea to keep a spare set of NiMH batteries for other devices that require AA size batteries on a regular basis. Use AA Alkaline batteries when the NiMH batteries need to be recharged and you want to continue enjoying the use of your camera.
Sounds to me like you have a winning plan of attack. I did the same thing a couple years back, bought one of those 4XAA battery holders with a little slide switch and put a jack on the end of the wire...worked fine. Then I bought a 6V 1500 mAh rechargeable battery from Radio Shack that was made for r/c cars and such. It worked great too. Never had problem one with either setup.