Like Mike, I've had my Vue about three years. After about 12 months the low transmitter battery warning came up so I replaced the ISS battery with a fresh one. 12 months or so later (July'ish 2013) the same message appeared. After reading about others having the same problem I decided to contact the Australian distributor
www.davisinstruments.com.au for a solution. Of course, by this time, my Vue was technically out of warranty. Also, in Australia, we need to purchase locally as the transmit frequency needs to be modified locally to comply with Australian spectrum laws.
Davis (Aus) suggested I upgrade the console firmware to "correct" the low battery voltage level and apply dielectric grease to the exposed data terminals inside the battery compartment. This required purchasing the $180 logger. Updated firmware and problem persisted. Contacted Davis (Asu) once more and they sent me a new ISS main board and battery/rain sensor board. After replacement the low battery warning disappeared, however, I now got ghost rainfall figures daily even though the skies were blue
. After numerous calls back and forth to Davis (Aust), and them to Davis (US) I recently got sent a new ISS main board with a newbattery/rain and temp/humidity sensor. The new sensors are now hard wired to the main board, instead of using the gold pin/rubber plug connection, and the ribbon cables are quite a bit shorter.
Anyway, problem seems to be fixed, although I'll let you know for sure in about a year
. I'm now using my logger via Cumulus to upload to wunderground and all is great.
Although the solution took six months to resolve and my console was technically out of warranty, Davis (Aus) was very good and the only cost to me, apart from the logger, was the return postage on the replaced parts.
So, there is a fix, I can't tell you what it is inside the ISS main board that makes it possible, but I'm another happy Davis customer.