See NDTV's review here http://gadgets.ndtv.com/video.aspx?id=156904 where they get 50 to 60 hours of stand by team at least and 16 hours of talk time and application usage. This may be a good product where there are a lot of power outages and maybe even as a standby phone.
Delhi: Zen Mobile, one of India’s fast-growing handset manufacturing
companies, has launched M25 mobile phone (dual sim-GSM+GSM), packed with an
unbelievable stand by time of 72 days and popular multimedia features at an
attractive price of Rs 3,400.
The handset has many
good features apart from its long battery life, like a 1.3 mp camera and a
2.4-inch TFT screen. The mobile facilitates the use of dual SIM cards, besides
giving an extensive storage capacity where more than 500 contacts can be stored.Read more at economictimes.indiatimes.com