help no battery is detected

hello ;
about two years a go I purchase a hp notebook dv6 1330ev before a couple months a go i install windows seven ultimate x32bit and replace the old battery to anew one now i have the battery icon with red x on it when and the battery does not charge but some times this " red x" disappear the battery charge when some times its still charging till its fully charged and some times its not its charge for a 20-30 % of its charge and the "red x" appear again and stop charging when the "red x" is one the icon and remove the AC power supply the windows did not detect there is no power and did not apply the selected power plan and keep working that happen when there is some charge in the battery to solve this problem first i was doing the following steps i remove the AC power plug and the battery from the notebook and push the power bottom for a while ( 2 min. approximately ) and left the notebook for 9 to 10 hours without any electricity connected to it after that i apply the battery again and the power to the notebook its start charging a gain for a while and the "red x " again appear but in the last time it does not work so i search the web for some suggestions to fix the problem on is to check the device manager and the batteries category i did it first i try to update the components but they were up -to - date and i try to uninstall re-install the AC adapter and the ACPI-complaint but the problem did not fixed. i also the other suggestion was to update the bios i did it but nothing change the battery keep don't charging later i tried the hp support assistant troubleshooter it did not recognize the battery and the problem still also i forgot to tell when shutdown the computer and remove the AC power supply and try to press the power bottom the notebook did not startup and nothing happen that is happen when try to shutdown when the " red x" is exist but if i try to shutdown when it is not there an do the above operation its start normally. so i am asking what to do to solve this and if it is a software or a hardware problem sorry for bad English and Stretching the subject thanks for reading my regards.