The batteries were so strongly adhered by the double face tape, that I ended up using a wooden paint stirrer with the end chamfered into the shape of a chisel (used a razor blade to cut the bevel on the end of the paint stirrer).
I was able to apply a lot of force using this tool to separate the batteries from the frame.
I attempted battery replacement, but during disassembly, i damaged the display by inserting the picks to far, and separating the display circuitry from the glass.
I used a Milwaukee precision hot tool model 1400, which has only a fixed heat setting, but it worked perfectly to soften the adhesive.
(I was very careful to heat the entire glass panel by playing the heat gun over the entire surface so that it would expand uniformly.
The batteries were so strongly adhered by the double face tape, that I ended up using a wooden paint stirrer with the end chamfered into the shape of a chisel (used a razor blade to cut the bevel on the end of the paint stirrer).
I was able to apply a lot of force using this tool to separate the batteries from the frame.
I attempted battery replacement, but during disassembly, i damaged the display by inserting the picks to far, and separating the display circuitry from the glass.
I used a Milwaukee precision hot tool model 1400, which has only a fixed heat setting, but it worked perfectly to soften the adhesive.
(I was very careful to heat the entire glass panel by playing the heat gun over the entire surface so that it would expand uniformly.
CAUTION: if you insert the picks too far, you risk damaging the display (separating the glass from the display circuitry).
The display circuitry is 14 mm from the side edges, 10 mm from the top edge, and 6 mm from the bottom edge.