Just changed my battery today. I discover that there are different battery brand out there and it is better to get back Sony (same with the original one). Before that I bought a "camelion" battery, after changing, green I key keep flashing. Yesterday went to TC, they check the battery voltage but found nothing wrong with its voltage but Green I key keep flashing. Changing to their battery then no problem. $10.70 for a tiny battery from TC is too ex. So decidede to get it from ABC shop and it cost only $2.
yo.. just bought a CR2025 battery and replaced it.. quite easy. i measured the old battery and its 2.9v le.. it is still healthy as its a 3v battery..new one is about 3.2V. but flashing light is off after battery replaced..