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patpatballball8888 -> Li-Po (lithum Polymer) battery for HL tank (8/19/2007 6:25:13 AM)
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After I receive my M26 Pershing HL tank, I was tempted to get another battery pack to replace the stock 2000mah Ni-Cd pack since its quality is just OK. From the search of the forum, other people already used 3000, 3600 or even 4000mah Ni-MH pack and have a very satisfactory result. Well, a 3600mah perhaps can run like more than one hour continuously, however, when I come to my situation, I rarely drive my tank for one hour without stop in single run or in single day, instead, I drive my tank mostly 10-15 mins a day or perhaps only drive on weekend only. High capacity may not my immediate need, however, a long shelf life (hold the capacity longer or slow self discharge rate) is what I am looking for, so, I do not have to worry after put the tank aside for few days and come back with the battery running out of juice because of the self discharge of Ni-Cd or Ni-MH.
Then I got lucky and got a good deal on a Li-Po battery one eBay, 7.4V 2050mah costs me $11 shipped, and I also have a spare Li-Po charger from my RC heli.
The battery weights only 1/3 and much small than the stock pack, lighter tanks means longer run time and no need to squeeze the battery into the compartment anymore.
Li-Po battery comes with a separately charge plug, extra soldering/wire for charging on board is not needed. (will do modification later on to put the charge plug near the turret since its small size)
Charging time is 1C, so same as fast Ni-Cd charger but the battery never get hot (not even warm), also can charge at any certain usage point, no worry of fully discharge before charge.
Finally, put it inside the tank and test run, the punch of the power is wonderful, it is max. 12C discharge rate, now I do not worry to put the metal track on. Well, perhaps, the stock pack is just not good enough.
P.S. Since I opened the tank and did the soldering work, after put back everything, the tank had short receiving range problem, the tank only responsed in around 3 feet diameter, extended the antenna help a bit, so it was not the Tx problem, Used mutlimeter to test the wire from the receiver board to the antenna joint, no broken wire, but still no luck. After spending an hour, finally figured out the problem is still this wire, it passed DC current no problem, but not RF signal. [;)]
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