C is a physics term for Coulombs; an Amp is 1 Coulomb per second. Or, 1 C = 1 Amp*second, so I guess if a battery was rated at 100C, you could push it to 50A for 2 sec before bad stuff happened. (That last bit is speculation, I'm not a LiPO battery expert, the price always turned me off ;) Even NiMH would be spendy for a tank...Figure a 10AH D-cell NiMH at 1.2V costs around $6 in bulk. Say you wanted 24V and 20AH, that's US$6 x 20 x 2 = US$240 just for one battery, not counting putting it together or paying someone to do so. For that price, a non-lottery-winner could buy 4 lead-acid batteries. A comparable pack of LiPO batteries (just googled it) would be six 11.1V 3.4AH packs, three parallel strings of two in series, at $70 each, for a total of $420. That is fast approaching the rolling chassis investment of my Sherman. It is also only rated at a discharge of 36C. I'm fairly sure that astarting a tank from a halt will require more than 36A for more than one second (okay, maybe less amps, but not many less). If you draw more than 18A for 2 seconds, you are in the danger zone with a $420 battery.
While the exotic is cool, the more mundane gets the job done, cheaper. -- Clark in Georgia who needs to get his tank moving so he can talk smack to Copperhead --~--~---------~--~----~------------~-------~--~----~ You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat -~----------~----~----~----~------~----~------~--~---
