Open the FOB and find out.
Open it up and I am sure you will find just one and you will then know how many and the correct size to buy.
Open the key fob and remove the battery which has a # on it, and then buy a duplicate.
CR1616
Open the key fob, remove the battery and look and see what size it is.
That depends on the problem. If it's just a battery problem, replace the battery and follow the instructions on the inside of the fob. If the fob has failed, Saturn requires that you take it to a dealer to program the replacement fob.
Panasonic CR1618
the key fob battery is the battey in a key fob torch
please help remote fob has new battery but still will not lock or unclock my 2000 hrv
A small battery that fits in a key fob or remote.
The battery size is CR2032. Pretty widely available at electronics stores
the battery is a 2032. and available at most good stores (eg tesco)
Usually the key FOB has a trunk latch, but if the battery runs out or you don't have a key FOB, check next to the drivers door, next to the gas release lever, there should be a trunk release lever.