Electrical Problem 2 months ago, the battery for my 2006 Ultra classic was dead. So, i bought a new one. After 1 week, the new battery dead. Also, the bike can't be started. Please i need the solution as soon as possible.

Just remove fuse to radio to see if this circuit is the problem. You can pull fuses one at a time and use voltmeter to see which are drawing current. Could be bad diodes in alternator which can be tested at parts store.

Is the new battery fully charged?

If you have a drain on your battery , it would not take 18 months for the battery to go dead . What do you mean The battery gauge in the dash shows only about 1/2 power, When ? When the vehicle is running ? Not charging ! The battery gauge as you call it has nothing to do with the Battery . That's showing how much the charging system is putting .The volt's indicator is controlled by the PCM - engine computer . With the engine running should show 14.1 volts .if your only seeing 7 the charging system isn't working. The alternator is controlled by the PCM as well ! Have it check by a GM dealer .

yep 1/11 in what year
1st month 2011 or what
best have the battery load tested but I suspect that it will fail ,the test

The battery on most motocycles cant take much abuse.Most batteries on bikes with proper care last about three or four years.If the one you have is this age or older I would purchase a new one.Good Luck.

alternator diodes is most common cause

Sounds like your charging system is not charging the battery.

Put a volt meter on the battery, run the engine up to maybe 2,000 RPM. The voltage must be at least 13.8V, but not more than 14.5.

If that is all OK, your battery is worn out, and is not holding sufficient reserve. It would need to be replaced.

you should replace the batteries

If your is exhibiting the same signs as a dead battery it really sounds like your alternator is bad. If you are handy, you can remove the alternator and take it to an autoparts store like autozone and they will test it for you. This is not a hard job to do, usually 2 electrical connections, 3-5 mounting bolts and you have to pop the belt off. Just reverse it to install a new one. Good luck! - Nick

1.See what the camera manual suggests.
2. Charge the batteries fully before using them. New ones are often not charged up. They could have been in a warehouse for months.
3. The electrical contacts on your camera, the ones that interface with the batteries, may be a little corroded. If you can access them easily, try cleaning them with the eraser on the end of a pencil. Same with the batteries themselves.
4. If exposed to prolonged high humidity, electrical problems may include not only the power supply, but other electrical switches, such as the reset button., which you cannot address on your own.
5. call the manufacturer