The T-8 has been selling like wild fire and the batteries have been breaking just as fast! The battery has a spring plastic tab that holds the battery on the back of the transceiver. It's a good idea in that there are no tools required to remove the battery but - after flexing a few times it BREAKS! This renders the battery and the radio useless.
ICOM has been replacing the batteries free but it is the same type of plastic, so they also BREAK. I have received opinions from two individuals familiar with plastic. One is an engineer and the other, a tester in the lab of an independent manufacturer. They both say that the fundamental design of the tab is wrong in that no mater what type of plastic is used, the tab will eventually break at the flex point. They both went on to say that with the proper formulation of the plastic, the tab may possibly last the life of the battery. A portion of the written statement follows:
"There are two problems with the design of the battery pack that effect the performance of the snap. The material appears to be either talc or fiber filled which will increase the impact strength of the material, but will also decrease the materials flexibility. The second issue is that the snap geometry itself is flawed. A well designed snap wing should be tapered in thickness so that the strain is evenly distributed along its length."
"In the case of the ICOM battery snap the strain is concentrated at the base of the snap in the U shaped area. It can be seen that the outer fibers of the U are strained past the materials allowable limit even under normal operation of the snap. Two solutions are available, change the material of the battery pack, or change the geometry of the snap."
As of this time ICOM has shown no willingness to redesign the batter retaining tab, nor have they given any indication that they are going to change the type of plastic used in the manufacturing process. They have yet to acknowledge that there may be a problem with the T-8 batteries. As of this time ICOM is replacing batteries that fail while under warranty.
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