I'm debating on purchasing a Tiny Tach. I plan to check the accuracy of the tach on my Javelin and then mount it on my Baja (if I ever put a floor in it). Although the price is not that high, I am concerned about the non-replaceable 5 year battery, as it may not get much use for a while if my current tach checks out. Has anybody ever attempted to get a look at what kind of battery it has? They charge for additional wire by the foot. Is there anything special about their wire? Can it be spliced and lengthened if necessary? Thanks in advance guys.