Invalid battery message comes up when I turn the phone on.
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.
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