My brother and I both have LG Optimus V's; last night he failed to charge his phone so when he left this morning I gave him the battery out of mine. I assume his phone just discharged until it shut off. At first, it was blinking the LG logo and the four bottom buttons on and off, but now it just shows the "Battery Required" screen. I've triple checked the connection - the battery is installed correctly and the connectors are clean. Phone has been plugged into the charger for over 30 minutes with no change. Any ideas?