My battery will not hold a charge. it was charged for 7 hrs and when i turned it on it said low power and shut off

Lots of things to try.

• Remove the battery plug it in and try to power on.
• Remove the battery and charging cable, hold the power button for about 10 seconds then replace battery and charging cable and try to power on.
• replace the charging cable and/or battery
• Do you hear any sounds when you try to power on?
• Anymore details would help a lot power issues can be as simple as charging cable not connected properly to system board issues.
  

replace your battery its gone over charge

1.Check the device's battery level for at least two bars of strength.
2.If the battery level is low, charge the battery.
3.If the issue is not resolved, remove the back cover.
4.Remove the battery.
5.Wait 10 seconds.
6.Press and hold the W key.
7.While pressing down the W key, re-insert the battery.
•The device restarts and after approximately 15 seconds, the 'Recovery' screen appears
•Release the power button but *continue holding the home button*, for another 30 seconds.
Step
Thanks

Try getting a new battery for it sounds like your battery is not holding a charge

GO TO THE CONTROL PANEL AND CHANGE THE MODE OF BATTERY AS EXPENDABLE SETTING IN WIN 7

Take your battery to your local auto parts dealer and they should charge for free..Though, assuming battery is low on acid, you will have to puchase battery acid and fill yourself prior to charge depending on whether you have a sealed battery or a refillable battery..The auto parts store should also let you know if its holding a charge..generally takes 24 hrs (trickle charge) depending on how they charge it. my car battery took 30 min. Refilled my hyosung battery with appropriate battery acid and turned out bad battery. I probably ruined by jumping it off while low on acid.

It takes over 7 hours to charge, so did you leave it charge overnight?

But while the original battery is chargable, disposable replacements are not. Here is what the manual says:

{ ...
The supplied battery is a Li-ion battery. It charges while in the camera using the supplied charger. The camera can also use a Duracell CP1 disposable Li battery, which has the same form factor as the supplied Li-ion cell. HP claim the Li-ion cell will provide power for approximately 200 shots under "average" use and 100 shots with "extensive use of the LCD and flash".
Charge time for the battery using the supplied charger and in-camera charging is 5-7 hrs for a fully depleted battery. In the optional docking station, charging takes 2.5-3.5 hrs and using the optional rapid charger, charging takes 1-2 hrs. ... }

http://www.bobatkins.com/photography/digital/hp707.html

connect it to a power supply and leave it for a few hours A battery that is totally depleted will take some time to recover and not show that it is even being charged as power is too low to light the LED.

It will require a full charge of about 10 hours to get it fully back into service. But the LED will ( or should turn on) after about 1-2 hrs depending on the condition of the battery. If after the charge the battery does not hold a charge lasting on average about 2 hrs , then change the battery.

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ups charged for 8 hrs .No alarms but on powerfail no output to connected device