Just thought I'd share my experience so far of changing the battery in my Transponder, so that it may help anyone else out there to do it. I followed some instructions I found, but pictures speak better than words and I couldn't find any on the internet, so I've put photos up for everyone. http://s1217.photobucket.com/albums/dd381/JodyStanton/Karting%20AMB%20TranX160%20Transponder/ The instructions did say to cut slight in from the side,bottom & top, but I actually found there's nothing at the side or bottom to avoid - I left the top filling compound in place but I'd guess there's nothing under it either.
My transponder has not been charging very well in the last few months, not many green flashes etc, and then a few days ago I put it on charge ready to use next weekend and get a charge cycle through it but it will no longer charge up (red flickery light). So I decided to change the battery in the hope that it resolves the issue. I'm waiting for my new NiCad 1/3AA batteries to arrive - need it working for this Saturday, so fingers crossed!
Here's the instructions I found, which I followed to mark out & slowly cut out the battery: Take the TX, with the loop at the top, and side with the cover removed facing you. The battery is on the LHS. Measuring in from the Left hand edge, draw a line 3mm in, vertically from top to bottom. Draw another line 18mm from the same edge. Now, measuring up from the bottom edge, 8mm, draw a horizontal line. Also, measure up 61mm from the botton edge, for another line. The battery, or batteries, is/are within this rectangle. The reason for the duality here, is that some Tx have a single AA size cell, and some have 3 x 1/3AA cells, depending on the age of the unit. Anyway, you will have to cut away the 'potting' within this rectangle. CAUTION...do NOT cut too far to the right, as this can ecroach upon the circuit board, and destroy the Tx completely. We use a 'dremel' type device, with very fine cutting heads. At the top and bottom of he battery, you will eventually uncover (eventually..because it takes quite some time!) the connection strips. Expose as much of these as you can, and then cut, as close as possible to the battery. When you have cut away ALL the encapsulant, you will be able to break the battery free of the case, and withdraw it. MAKE A NOTE OF WHICH WAY IT GOES!!!!!!(I think they all have +ve at the bottom, but I could be wrong) Now, seal the new battery(s) in with epoxy, or similar....NOT HOT GLUE!
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