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I am not familiar with the TracFone V170 but most phones now communicate with the battery. They do this because the battery contains a small computer chip which monitors the charge state, temperature etc.. If this chip is faulty or missing because it is a cheap copy battery, some phones will not work properly. They usually power up okay but will not charge or will charge really slowly. There are various messages they may give including "alien battery", "Invalid Battery" to name a few. If it is unable to communicate with the battery, it will not usually charge as fast as it could because it cannot tell if the battery is overheating so it will always trickle charge an unknown battery.
You will notice a battery like this because it has at least three battery connections. Older ones only had two.
try use a good battery. if it does not work, try check on the connecting pins on the battery connector of your cellphone. if still a problem, try disassemble the cellphone to check the battery interface on your cellphone, clean both connector and the interface of your cellphone... if still a problem, best to repair it to a nearest cellphone technician...
Usually when a rechargable battery won't take a charge it need to be replaced. I have had good luck purchasing replacement phone batteries on ebay but you can also try a local phone store or Radio Shack. Its possible your charger is bad but it is usually a bad battery as they have a finite life where the chargers seem to work forever unless damaged by being dropped
If you drained the battery try to recharge again from your pc or laptop, I am sure that there is nothing wrong happened when you left your mobile phone connected with your pc. You PC is off, so there is no power supply that will flow to your mobile or charger. It make sense that it just drained. Try to buy a new battery and test it, let's see if your mobile will work again, if you don't want to buy a new battery to waste some penny. Just bring your phone to your nearest technical shop to test it. I guess they will not charge you for that.
Totally discharging the battery is the way to go. But what you can also do to use your phone in the meantime is this. Plug your charger into the phone withOUT your battery in. It will tell you "Unable to Charge." When it says this, put the battery in. It might tell you "Invalid Battery" a couple more times, but it did eventually say "Charging Battery" for me. After that, simply turn the phone on and it will return to normal. This is when you drain the battery completely. Once I did that, I did not get the invalid battery error again.