My 636 wont start on the button, it was as if my battery was dead but i took the battery off put it on the charger and it was fully charged, what is wrong with my bike

If the security light is blinking it will not start. The security system needs to be reset. You will have to have a fully charged battery to reset the system. With a full charged battery turn the ignition forward until the warning lights come on and leave the key in the on position for 15min. Turn key off and wait 10sec. then try and start.You may have to perform this procedure a couple of times, however, it is usually successful the first try. The reduced power light can be set by a low voltage/poor charge battery

You need a new battery if your alternator is putting out 14.5 volts you can try a charger just make sure you disconnect both cables and try a charge of a charger if it still doesn't take you most likely have a dead cell which may as well be a dead no good battery

How do you know the battery is fully charged? Simply hooking a battery up to a charger does not ensure that the battery is being charged. The symptoms you mention are indicative of a dead battery.

Have you tried to remove the battery and put it back in and try to turn it on. Try removing the battery and putting the charger in and starting the PSP. If it starts, it might be the battery. If it doesn't, it's either the plugin for the charger or the PSP is just dead. If it does start with the charger, try putting the battery back in, if it charges awesome. If it doesn't the battery might be dead.

try new fuel & plugs...

How many amps does this charger put out????
A small trickle charger will take forever to fully recharge a dead battery, you'll need to have a battery charger that can put out enough amps to properly charge a dead battery.To clarify, the chargers sold at Sears, the large square types on wheels are the best for charging dead batteries and they also have an amp meter telling you how much the battery is accepting. After you charge your battery, you should be around 12.5 volts to 12.7 volts. DO NOT OVER CHARGE!!!

Was the battery checked before it was sold to you? Batteries will lose their charge over a period of time even when not hooked up. If you have a voltmeter it should read 12.8 volts on a fully charged battery.
Have you tried to boost the car with cables?
I suspect if the car was working OK 3 months ago it should start. Which leads me to suggest an undercharged battery.

the battery's are most likely dead, (like the real dead) after many uses of rechargeable battery's they slow stop holding charge at all, make sure when you get a new rechargeable battery you fully charge it once and fully discharge it once this will increase batterys life time

If the Red Led stays turned on it is as simple as this.....the solder connecting your power on button to the system board in your phone has worn off..... you must pop the power button at the top of your phone off and you will be able to see where the soldering paste has simply worn off. At my job I have a soldering machine so it was not problem for me. I simply took pasted it back to the board with tin.....now this may require some work. just pop off the top section of you phone with a flathead screw driver and pop out the power button. look closely and you should be able to see where the botton has lifted from the little greenish system board..... Find someone to solder it, put it back together and it works like new.........SEE YA

You simply need a new battery. Razr batteries are notorious for loosing life and the entire problem is the chargers you are using. You MUST have one with an IC chip that tells it when to stop charging otherwise watch how long you are charging it. Also when you have a new battery let it fully charge and fully die twice before you start normal charging this helps a lot.