Educate me..... I want to go Lipo. I have done some research and just get confused after awhile. I know I need a Lipo battery and possibly a new ESC and a charger for the Lipo battery. But I'm not 100% sure what I need and what brands are good....... My current set up is a 6 cell Tenergy 4200mAh, Novak XRS ESC. Nick |
Re: Educate me..... 1. You MUST have a lipo compatible charger. No ifs, ands, or buts there. 2. All esc's will work with lipo, but not all will let you know when its time to stop running it because the battery is too low. Lipos don't like to be drawn down past a certain point...newer esc's will shut themselves down when that point is reached so the battery isn't damaged. You can buy add-on alarms and cut-offs, so that is no big deal. 3. Since you are going lipo, and possibly looking at a new esc, make sure you get one that is 3s capable. You'll really appreciate and enjoy the extra voltage. 4. There are many brands to chose from and price is rarely an indication of quality. I buy my packs from >>ValueHobby<< and have had great success. Take care of them like you are supposed to and they'll live long. |
Re: Educate me..... I'm confused as to what confused you? It's pretty straight forward, just search for lipo explosions and you'll see what happens if you screw up :mrgreen: |
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Ok so any suggestions on a good charger? Are there chargers that can do both Lipo and regular battery cells? And as far as the ESC with the voltage cut off, I have heard of that before, is that what a BEC is?? I was thinking of buying the Novak Rooster Crawler ESC mainly because it has a neutral brake (or at least that's how I'm reading it) and it has the voltage lipo cut off.... |
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For specific lipo classification, read some of the stickies in the electronics section. I've never used a Novak for crawling, but I've seen enough of them fail spectacularly to make me not want one. Same with Tekin. Smoking your electronics is one thing, catching fire is another. |
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Holmes Hobbies / Holmes Bikes :: Battery Chargers :: Hyperion EOS0606I AC/DC Charger It can pretty much do it all and it's so simple even I can use it. For Speed controllers, I'm sure people will again disagree with me but I'd go with a Holmes BR-XL and don't look back. Grab a Castle Link and you have all the flexibility you'd need: Holmes Hobbies / Holmes Bikes :: Motor Speed Controllers :: Holmes Hobbies TorqueMaster BR-XL Ok, let the disagreeing begin :flipoff: |
Re: Educate me..... I actually agree on the esc, as for the charger, I just picked up the new traxxas lipo charger, I gotta say it is pretty nice. Plus it's the right price "thumbsup" |
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(I'm not an electrical engineering professor, so if you want to know the difference between switching and linear BECs, you'll hafta hit somebody else up for the differences in those.) |
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But I'm not sure in all that if you actually answered what a BEC is or does.....or maybe I just got lost.....happens a lot. Oh and I passed up "kid" along time ago.....LOL!! Nick |
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BEC's supply and regulate power from the battery directly to your servo or whatever else you want to power it with. They are typically able to handle much higher loads than the internal bec built into most speed controls. |
Re: Educate me..... actually the first becs were built into the receivers and the mechanical speed controls had a plug to power them"thumbsup" |
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I just fly thru hear and read the quick replies to mine and then have to move on. But I will trust me..... Nick |
Re: Educate me..... Well after reading some of the stickies I was still over whelmed with info, I happen to be up in Denver yesterday and went into my favorite hobby store and started to ask questions. Well after a TON of numbers that just seemed to confuse me more I think I know what I need..... according to the guy there I should look into a Thunder Power battery Charger, 65c 3s 1350mAh Lipo battery. The other huge suggestion was to upgrade my ESC to a brushless system. Nick |
Re: Educate me..... You can't go wrong with a 3s. 3=number of cells, each being 3.7volts minimum. S=series, each cell wired together for more voltage. I grew up on nice 1.2v batteries, and after an hour of YouTube (search lipo puncture/fire/drop) I wanted to hurl. I took the plunge and went with a proven but basic Tenergy knockoff tb6ac charger, 3s 50c 5000 mAh batteries and so far no fires. Btw, 50c means the maximum discharge rate the battery can handle before.... well, refer to my YouTube search for that. The number of "c" is a multiplier. So 5000mAh ( or 5amps) times the Max discharge rate equals 250amp maximum burst rating. Brushless motors are a completely different topic. But on to your original post. You are running a 7.2v battery pack right now. Pure and simple. That in nicad speak is a 6 cell. You could go with a high "c" 2s battery to replace yours and keep the motor and esc you have. That will make it a 2cell (lipo speak) battery, or 7.4volts. The. 2 volt difference wont be noticeable. But the power you get from the lipo will be. The higher c rate also keeps the battery from heating up too much, which trust me, is a good thing. So remember lipos are 3.7v per cell, and high C is good. In the noob section there is alot of info so just take it one thing at a time and it will all click soon. Hope this helps. |
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Lipo's are not hard to understand once you get the basics, and aren't dangerous unless you abuse them. Remember that the main job of the guy behind the hobby counter is to sell you something, so take all of his suggestions with a grain of salt. Most are still not up to speed on crawling. You don't have to replace your existing speed control to run lipo as long as you don't plan on exceeding the rated voltage of the unit itself. You can pick up an inexpensive lipo alarm or cutoff that plugs into the system and warns you when its time to swap packs. |
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Nick |
Re: Educate me..... It all you want is to go lipo, I wouldn't replace your motor and esc until you have a few runs with a new lipo. You get such a tremendous increase in power output for a longer duration with a lithium instead of nicad. Those little battery meters (5-20$ any hobby place) can warn you with a beep when the voltage gets too low and your all set. They plug into a "balancing cable" that is wired into the battery. Come are led only and some are a beeper. A must have once you push your rig. A warning, however. If you plan to go 3s lipo you will be pushing 11.1v to your esc and motor. Make sure it can handle that much voltage, especially the BEC inside the esc. Going 3s lipo is like pushing a 9 cell nicad pack. |
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And he doesn't have any airplanes, copters of boats there either...crawlers only! |
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