The battery got flat and it went off but now after i've charged it it doesn't want to switch on again, pls tell me what should I do?

on a lot of these late model computer base cars when battery power get low the computer gets confused. try this disconnect the neg. battery cable. charge the battery. reconnect and try again. my son cobalt battery went bad key was stuck in the igntion. good luck.

It sounds like the phone's battery is discharged. plug it in to your charger for 3-4 hours and try again, if not check your charger or USB lead by borrowing one or purchase a low cost one from eBay

Friend you did not tell us if there was correct output voltage after charging and the voltage after 2 hours. However, there could be a short circuit that drains the batteries,was the system left on for the 2 hours, are the batteries of a standard?Good Luck from Ukachi Edwin

Sounds like its a bad voltage regulator that will cause it to over charge.

Hi there!
If you're encountering this kind of problem on your phone then all you have to do is powercycle your phone.You can do that by removing the battery while the phone is on.After 15 seconds kindly reinsert the battery and turn the phone on again.If you still have the same error message then kindly go to a different location because it might be that the phone is not getting a good reception.And if you still have the same problem then kindly contact your service provider because its a probable issue with the network,not with the phone.Since you've mentioned that your phone keeps on turning off then ill be advising you to please check if your battery is properly holding a charge because it might be that your phone doesn't have enough power.
Thanks!

If its totally drained you need to wait for a couple of minutes while its being charge. T happened to my O2 Pocket PC before.Thanks

Not at all common but not unknown. Indeed this very same question was asked on Fixya By tom33834 on Dec 03, 2009 http://www.fixya.com/motorcycles/t3564846-yamaha_r1_07_battery_polarity_backwards
I do know of someone else that has also had exactly the same issue. In that particular case the original battery had be charged with reverse polarity when it had been charged for the very first time.
I would suggest you get a multimeter / DVM (Digital Volt Meter) and check the actual polarity of the battery - even though it is "flat" it should still have some residual voltage even if it is not the full 12 volts - with Red meter lead to Red battery lead (and black to black) check the display to see if the reading is "correct" eg 11.45 and NOT -11.45 (note the MINUS sign) If it IS correct (which is correct FOR THE BIKE) then that would be WRONG for the BATTERY markings and would definitely indicate a reverse polarity charged battery.
When you go to charge it keep it the same way round - charge as per the bike's polarity. HOWEVER if you ever buy a NEW BATTERY do not fit it as per the old one - you will almost certainly blow some fuses and maybe more.
On a further point, if I remember correctly, to fit the battery "the wrong way round" the -ve terminal is on the righthand side of the bike and to get the red +ve cable to reach the battery will be sitting in the upright position - that is the TOP of the battery is at the top. This is NOT how the battery should be fitted because if you turn it around as it should be (ie RED to +ve) then the battery lead is just not long enough and won't reach. When correctly fitted "the right way round" the battery is actually laying on its side with the top of the battery pointing towards the back of the bike.
If you know anyone else with an R1 perhaps you could have a look at theirs and compare it with yours.
Hope this helps

Well, with my Nikon, the light flashes to show the battery is charging. It stays on when it's charged. My battery and spare battery are 2 years old and working fine. I'd say wait till it stops flashing...hour or 2 in my case, though I never let them run down all the way.

Hi Friend,
Initially u remove the sim card,battery from the mobile phone
keep it for 30 sec,then replace the battery and the sim card.Now hold the switch on button for 5 sec.now u will be able to switch on the mobile.Now u can charge ur mobile


Check and revert back


Regards,
Ayyasam

It's sound to me like you guys might have dead cell... change the battery and it should be fine.
Battery Maintainance
1: Try and charge battery when it's totally off/flat
2: Only charge battery till battery full indication comes up.
3: When disconnecting battery switch phone off first.
4: When phone is not in use don't leave it in the sun facing the battery.

.....Hope this helps.
Don Cass