I didn't receive a response to my support ticket inquiry that I made three days ago, so I'm posting here. The T620 I received Nov. 28 has a very short battery life- fully charged, no programs running, it drains in 4-5 days. Even with a full charge, a couple of times the unit would not switch on, requiring a reset. In wifi mode, power meter drops about 15% after only a minute or two, with low battery warning in about 40 minutes. In gps mode, it's good for an hour or so. In comparison, the Mio 168 which has only a 10% larger battery lasts 3-4 times longer in comparable modes.