In order for such structure to work properly electrically, few things need to be review. 1) Constant compression part (not necessary a Spring) that take/place slacks due to temperature coefficient of expansion in the battery and the Tube itself, WHILE maintaining rated electrical contact pressure at the cell terminals to within safe side of limit to sustain that operating current. 2) Although the battery contact surface is intended to be flat so "surface" contact may be possible, but will never happen in reality. That resulted in a "point" contact of variable contact area depending on the "local" irregular contacted profile, convex or concave. Under such condition, it is wise to include a thin Tin-Lead sheet (dia.= terminal dia.) in between +ve of one to the -ve of the other battery terminal. That should intermatch the irregular terminals surface giving optimal contact area, hence minimal interfacing resistance. However, the interfacing sheet metal must not be too soft like pure lead. The sheet can become a wear and tear part that needs to replace once a year or so depending on the amount of vibration (at ? axis) the pack took, especially if it is too soft and thin. It must be replaced before a pinch-throgh existing on sheet. (all that assume there is a dynamic compressive part included in the pack as described in 1) above.) My comment: A Power Tube matches my habit of battery maintenance, because I wanted to identify a weaker cell in a battery once in a while. I will to replace it when I find one. I have more problem with the more popular strip-less solder construction, as I cannot separate a weak battery without some degree of harm or permanent to the adjacent cells. I am expecting the Power Tube to allow maintenance described as above. YK Chan Seattle area. In a message dated 1/22/00 4:47:34 AM Pacific Standard Time, [EMAIL PROTECTED] writes: << E-Flyers, For some time now I have seen adverts for solderless power tube; a power pack container that holds 2-12 Sub-C cells without the cells being soldered together. Does anyone have any experience with this product? >> RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
