I have a B450xt headset, it went dead, has been charging for 3 hours, I unplug it and it wont turn on

SOURCE: won't turn on, take charge, communicate

I have the same one and let it go dead all the time. It will take 5 - 10 minutes after you plug it in for the blue light to come on when it's dead. Mine recently decided to WOULD NOT charge. It turned out to be the three little pins on the charger were dirty and sticking. I used a cotton swab to clean them with some rubbing alcohol and a quick dab on the contacts of the headset. Works great now.

SOURCE: Isonic Snapbox mp3 player wont turn on or charge

get a new mp3

SOURCE: Battery Dont Charge

jpierre's solution (in another thread) was right on the money. Touch the positive (+)end of the 9v battery to the positive (+) end of the camera battery.Leave them touching for a few seconds (10 seconds should be more thansufficient). Seems these lithium-ion batteries are subject to a'digital memory.' Subjecting it to a volt surge almost three timeshigher seems to clear it.

http://www.batteryuniversity.com/parttwo-34.htm

In short, it works like a charm.

SOURCE: headset not charging

Sometimes it takes longer than two hours. Leave it plugged in overnight if you can. The indicator light should go off after fully charging.

SOURCE: wont turn on charged it it still wont turn on ,

Try holding the power button while plugging it in. Also try holding the power button while wiggling a mini screwdriver in the reset hole