Mustang Tech

I've managed to find a battery that will fit in the VT600 with double the capacity.
The stock battery is 500mAh and the bigger one is 1000mAh, so it should be able to keep your tracker alive for twice as long in the event that the main battery power is cut.

I also have stock replacement ones now.

They're both available in the store.

http://www.mustangtech.com.au/store/index.php?cPath=24

good idea. the longer you can get a signal if things go bad the more chance you have of finding it.