Its been 5 days since my iPhone went through the washer. its been in rice the whole time and it still wouldn't turn on, so i plugged it into the computer and it turned on. The battery said 61% then when i unplugged it it shut completely down, then apple logo appeared and a few seconds later it was back up and running with the battery showing 51%. it has done this a few more times without the drop in battery life. Is this a sign i need a new battery?