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The humble iCOMM, works well while the internal battery is good, but after a year or so..........they stop working. How to tell, its the iCOMM battery. If the little red light no longer comes on and the static burst is not sounding, there is a good chance it is just a flat battery. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Internal iCOMM battery Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Freight is expensive to get the very specific battery that is inside. Genuine replacement batt $5 US, freight, $25 US. Whattt!!! $30 US.... for a battery.....at least that's what I said. (approx $38.40 AUS) So I decided to do a little research, and come up with a reasonably simple and inexpensive mod, approx $12-$15 Aus. A simple AA battery holder and a rechargeable Lithium ion battery. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Not just any kind of rechargeable battery can be used. The iCOMM is sensitive to voltage, so a 3.6 volt battery is required. The milliamp hour rating, or how much draw per hour on the battery, is only 560mAh, not bad for its small size, but I have replaced it with a 900mAh, so almost twice the capacity, and rechargeable. Approximate lifespan......Years and years. I chose to go with a battery with an internal protection circuit, as Li-ion batteries are finicky with charging. (have been known to EXPLODE). A digital battery charger, designed to suit 3.6-3.7 volts is perfect. Available on evilbay for as cheap as $5 shipped from China Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. As I discovered during the research phase, the internal battery is easily removed. Image has been scaled down 42% (600x800). Click this bar to view original image (1024x1365). Click image to open in new window. First I added some adhesive Velcro to the back of the battery holder. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Then I drilled a couple of small holes, one in either side of the bottom half of the iCOMM casing. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Thread the red +, and black - ,wires through the holes of the casing.(From outside through to inside) When you flip the circuit board of the iCOMM over you can solder the wires to the corresponding posts. The outer most post is the positive (+) and the inner post the negative(-). Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Flip the circuit board back over and fit back into the case. Please note, you will actually have to fit the circuit board back into the top part of the case as it is the half that has all the plug holes and LED hole. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Place the two halves together, put the screw back in, and add the opposite half of the adhesive Velcro to the end of the iCOMM. Feed the wires in through the holes to keep the excess out of the way. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Tested for success, my iCOMM is again fully operational. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. As you can see, the overall size hasn't changed too much. iCOMM 8cm long, iCOMM with external battery adaption, 10cm long. The weight has increased by only 20 grams. Image has been scaled down 42% (600x450). Click this bar to view original image (1024x768). Click image to open in new window. Parts List and cost Battery Holder AA size $1.00 UltraFire Li-ion battery $6.00 (Protected circuit) Digital battery charger $5.00 miscellaneous bits $3.00 Battery holder from Jaycar, all other parts from ebay. Please note: These prices were in Australian $, so would be cheaper again in US$