Sony ericsson w800i

First try to replace the battery, a drained or low voltage battery won't charge up.

For infos on how to fix the Sony Ericsson Xperia X1 Not charging:
http://mobilephonerepairguides.blogspot.com/2011/01/sony-ericsson-xperia-x1-not-charging.html

replace your battery.if that doesnt fix it,u'll need to contact a service center

off the phone 4 some time and on it then charge,if no change, change ur charger if nothing happen change ur battery or check ur charging port

Since you've got a new charging unit, you may need to try using different battery. If same problem occurs, then plug the charger to the phone and slowly wiggle the charger to see if the power jack is loose.

If everything looks okay, then there's a loose connection inside or a bad IC that needs to be replaced. And you may need to contact the manufacturer for repair.

Have a great day!

The battery you are using is not of good quality.Alien battery actually is categorized as the lowest quality of compatible batteries, Optimized Charging refers to the advanced charging circuit in SE phones that prevents damage and ensures the battery is properly charged.

i have sony ericsson w800i
when i put to phone charge does not work charge, sometime connect charger & start charge

these no problemes

if charge down in 3 hours mean battery problem. if the mobile show "not charging" message mean charger problem.

Yes Just purchase the code from http://www.onlinegsmunlock.com/ then follow the instructions as follows:
Warning : Do not enter any wrong unlock codes on your Sony Ericsson W800i mobile phones. If you enter over a certain amount of wrong unlock codes on your Sony Ericsson W800i mobile phone, your phone may get hard locked and sometimes become unusable.
1 - Switch ON your Sony Ericsson W800i without any SIM Card,
2 - Press the left arrow key/button once,
3 - Press the button * twice,
4 - Press the left arrow key/button once,
5 - The message "Personalize with MNC2" will appear, (or you will have displayed an unlock menu, select the lock you want to unlock)
6 - Enter the Unlock Code.

If your Sony Ericsson W800i does not have a left arrow button/key(e.g. Sony Ericsson W950i) and on a few phones(not all) that have a "JOGDIAL" you must press the "down arrow" key/button instead of the "left arrow" key/button for step 2 & 4. We mean by "Down Arrow" to direct the Jogdial down! In the Sony Ericsson W950i and some other models, the down arrow button/key would be located on the side of the phone.

you need to clean the bit at the end of the fone with a rubber and gently blow away the dirt then clean your battery see if that works becasue thats wot happended with my fone and that worked for me hope i helped thanks x