How to change batteries on Xtreme electric Scooter 360 ?

Probably bad batteries.You need to explain it more otherwise nobody would know what type of problem it really is. Maybe say if you have charged it or anything useful:)

The scooter uses batteries specifically designed for deep discharge applications. If your new batteries are not lasting then they may only be suitable for standby or backup type applications like for your house alarm system or garage door opener when the mains power goes out.

defective batteries or charger, try to charge the batteries one at a time with a car charger, if they charge then replace the charger, if they do not then the batteries are in need of replacment.

Your break release shifter is in the push the scooter mode. Put it back in gear and the horn doesn' beep and it should run..
The horn beeping is the alarm to tell you the break release is on.

It is usually located under the seat on the body of the top of the battery housing. Looks like a stick with a ball on it.

You probably have a 24 volt or 36 volt system. For each 12 volts, you will need 1 battery. Thus, you will need 2-3 batteries. The batteries are located between the footrest in the middle. Some have an access panel. If your model does not have that panel, then you have to remove the seat and plastic body, a very time consuming and annoying process. You may even have to remove the steering stem. Pull out the batteries, TAKE SEVERAL PICTURES of the wiring so you can put it back together exactly the same way. The wires have to be in series. If you screw this up, best case it won't charge properly, worst case you can overheat and damage the batteries, even causing them to explode and cause a fire in extreme cases. The old wires may be soldered on. Just snip them off and install new connectors that you can find at walmart, radio shack, or any automotive store. The manufacturer should have left a little extra wire to allow for this. If not, you may have to remove the solder with a soldering gun and reuse the existing connectors, or run new wire. You probably need 12V7AH, 12V8AH, 12V10AH, or 12V12AH SLA batteries(SLA means sealed lead acid, V means Volts, and AH means Amp Hour). It should be stamped on the side of the battery. 10AH and 12AH are the most common. They should cost about $25-$40 each depending on the supplier and size of the battery. The higher the AH, the more expensive the battery. Once you've changed the batteries, charge them completely before using it. FYI: Always fully recharge the batteries after you deplete them. Letting them sit discharged will drastically shorten their life or even ruin brand new batteries. Also recharge the batteries every couple of weeks, even if you aren't using the scooter. They gradually discharge when sitting. If you keep the batteries charged, you should expect about 1.5 - 2 years out of them for average use. Hope this helps. www.solanocycle.com

You can get replacement batteries from here http://bit.ly/1gaD7Qf . Watch the video below to see how to replace them in any razor scooter. You can use your current wires to save up some money.

This scooter require two batteries, not one. It is usually a good idea to replace both batteries at the same time, even though one is obviously bad, and the other "seems" okay. These 12 volt DC batteries (VDC) work in tandem to produce the 24 volts that the scooter operates on. In a perfect world, they would both live a long and happy life, but reality is that some die young, others old. Since they are joined together, the one that's going out saps the life out of the other one, so take a bullet and replace both batteries. Make sure you completely charge the scooter when you get the new ones in. Verify that your charger is working properly. To properly charge the 24 VDC system, the chargers have to have an output of about 26-28VDC. The output must be higher than the rated voltage of the two batteries put together to charge. While you have the shell off the scooter, you can see if the charger is working by measuring across the terminal on each battery with the charger off. Note the meter reading. It should be 12-13 VDC. Put it on the charger and retake the reading, and each battery should show an increase in the voltage due to the boost from the charger. After three hours, each battery should show about a 13.5 VDC reading which should hold above 12 for a good 8-10 miles. Always charge your batteries overnight, and if not in use, disconnect them completely with a full charge on the batteries.

Hi, did you charge the batteries for at least 8 hours? Make sure that your charger has a RED Light When you plug it in, You should see Green light in 4-8 hours depending on the Batteries.
Secondly Your scooter batteries were dead when you got the Scooter, Judging from the fact you didn't get a Charger with it. I would recommend getting a voltmeter and checking the battery voltages. If the voltage is 11-12 volts, then you need new batteries. If this doesn't work check that fuse on the scooter it could be blown.

That scooter brand is also known under the name
"X-treme" and the one your looking for is the "XG-470" I believe. Here is a link for an owners manuel to it. Hope it helps out.
http://manuals.monsterscooterparts.com/recreational/X-Treme/owners-manual-xtreme-xg-470.pdf