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Model Forum / Radio Controlled / Land Models / November 2003battery all done???
Alright, I have a little radio shack truck, and the battery is rated for 7.2V and 1700MAH, well, i got a meter running at the battery side of the connection ont he charger. When charging it peaks at about 9volts, sounds right I guess, but when it shuts off (the charger cycles, on... off.... on...) the battery drops down about to 6.5V, I cant seem to get over that, so i am pretty sure the batterys done for. the problem is, the battery was working fine, for a while, no fading in performance, then I left the battery in the truck for about 2 days with it on (oops) and now the battery wont charge. So did the truck somehow ruin the battery > Alright, I have a little radio shack truck, and the battery is rated > for 7.2V and 1700MAH, well, i got a meter running at the battery side [quoted text clipped - 8 lines] > > So did the truck somehow ruin the battery Try a different charger. > Alright, I have a little radio shack truck, and the battery is rated > for 7.2V and 1700MAH, well, i got a meter running at the battery side [quoted text clipped - 8 lines] > > So did the truck somehow ruin the battery Sounds like one of the cells has died on you. Possibly a victim of "cell reversal" which can occur when a battery pack is discharged to the max. If a cell within a pack is significantly weaker then the other cells, it will discharge completely before the better cells. It can then take on a "reverse polarity" due to the current flowing through it from the cells with remaining power. The cell is then generally junk, although there are methods that may revive it, at least in the short run.  SignatureJim ----- www.onandaga.com u probly drained the battery wa 2 low so it doesnt have power 2 read the charger and charge -- e-maxx_racing ----------------------------------------------------------------------------------- Posted from the RCGroups.com Discussion Forums. Visit us at http://www.rcgroups.com <------- Win free R/C Gear! View this thread at rcgroups.com: http://www.rcgroups.com/forums/showthread.php?threadid=158000 > > Alright, I have a little radio shack truck, and the battery is rated > > for 7.2V and 1700MAH, well, i got a meter running at the battery side [quoted text clipped - 16 lines] > remaining power. The cell is then generally junk, although there are > methods that may revive it, at least in the short run. Well if I runa meter accross the wires i get 6 volts, so I figure a cell is dead. How do you "revive" them, I really wish this didnt happen... Also as a side note, where can I get real cheap 7.2V battery packs? > Also as a side note, where can I get real cheap 7.2V battery packs? Venom is marketing 3000mah stick packs for about 25.00 at your LHS, that come with a tamiya style connector. Dynamite is selling their FunPack 3000, at your LHS for about 29.00/each. those two are the best bang for your buck if you want to walk into a hobby shop and buy over the counter. http://venom-racing.com/ Signatureftupet is as ftupet does > Also as a side note, where can I get real cheap 7.2V battery packs? Depends on how cheap you want. HobbyPeople sell some 7.2V packs for as low as $8.99. I do not know how well they work in a cheap RC car as I use one in my electric starter for my nitro truck. > > Also as a side note, where can I get real cheap 7.2V battery packs? > > Depends on how cheap you want. HobbyPeople sell some 7.2V packs for as > low as $8.99. I do not know how well they work in a cheap RC car as I > use one in my electric starter for my nitro truck. Ya, im gonna buy a new one. But thing I dont knwo is the battery I have now is a 7.2V 1700Mah whats he difference between that and a 3000mah? More power? > Ya, im gonna buy a new one. But thing I dont knwo is the battery I > have now is a 7.2V 1700Mah whats he difference between that and a > 3000mah? More power? Just lasts longer. A decent battery will also have a flatter discharge curve meaning it holds voltage stable right to the end when it finally drops off. A cheap battery will have a steep curve with voltage tapering off right from the start. So I checked out those batterys that are 8.99, I was thinking that my old battery was a 1700mah, and these are 1500mah, But i can get 3 for the price of one radioshack job. So with a 1500mah, it wont be too much fo a difference right? Even if it is, I will have three |
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