etag transponders

Dunno about other etags, but the wife's etag has a Saft 3.6V lithium battery.

The data sheet for the ones supplied by the NSW RTA is at

thanks

The tolling companies replace the etags when the batteries go flat.

MrT.

ery.

from the pic supplied from bobs link, those batteries (in RAM backup applications) I have found will last 20 years (measured full terminal voltage when replaced). Depending on the transmission power, and how often, as well as the sounder and how often its activated, a long life is quite viable.

I didnt think any battery would cope well with the temperatures involved, especially when placed at the highest (hottest) point in the car (upper windscreen)

They most likely use the 120degC rated Lithium-thionyl chloride cells.

I've used (and thermal cycled) them in operating apps from 0degC to

80+degC (ironically in two of the listed apps - sonarbuoys and oil exploration), they are remarkably durable.

Dave.

in

battery.