I bought 4 sentinel snake repellers about 3 years ago. They worked a treat. but now they have stopped and even though they are solar opperated they need the battery changed as they ar e so flat they won't work. But the dilema is I can't seem to get the battery off! I've had 2 mates have a look and they can't work it out. I phoned the manufacturers up in QLD repeatedly but they don't phone back, won't anser the phones. i've emailed them, written to them. So annoyed with the lack of survice. But more so frustrated as these expensive things won't work now. I'm hoping there is someone on the forum that knows how to change the battery on them. Thanks.