rbryn
Flying officer
Posts: 13 
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Post by rbryn on Jul 27, 2008 14:25:40 GMT 1
Is there a good place to explain what differences are between lipo vs the nimh batteries?
For example... I run the 8cell NiMH that has a 9.6V, the lipos all seem to have 11.1V or 7.4V. I see references to mAH but dont know what that is or how it relates.
I'm guessing that going to lipos I would want the 11.1v but will the stock ESC have any problem with that? What is the mAH and what does that relate to (runtime?)?
I know that lipos last longer, are lighter etc. etc. I'm just looking for info to make an informed purchase.
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Post by duck9191 on Jul 27, 2008 15:15:40 GMT 1
mah is a rating for how much energy the battery can store, the higher the mah the longer the run time and the more current you can pull out of the battery. also another thing to look for is the C rating of the battery, this relates to how much current the battery can safely deliver with out over heating the cell.
to figure out how many amps a battery can deliver safely you take the mah of battery for example we will go with 1500mah. then you take the continues C rating and multiply then, so say its a 10c battery. 1500*10=15000. then divided that by 1000 to get from milliamp to amps and you get 15000/1000=15, or 15 amps. you never want to use a battery that cant deliver the right amount of current for you set up, your asking for trouble.
lipo cells have an nominal voltage of 3.7 volts. another thing you will see describing lipos is will be a 1s, 2s, 3s, and so on. this stands for how many cells in series are in the pack. for the cub you want the 3s or 3 cell 11.1, it will give you a nice kick of power over stock, plus be lighter and have an higher capacity. the stock esc should be ok, dont run wot all the time and prop down to a 10x6 to keep the amps down and to help keep the esc cool.
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rbryn
Flying officer
Posts: 13
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Post by rbryn on Jul 27, 2008 17:12:34 GMT 1
thx thats exactly what i was looking for.
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rbryn
Flying officer
Posts: 13
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Post by rbryn on Jul 28, 2008 3:47:54 GMT 1
ok, one more stupid question... searching around tonight on the internet looking at lipo batteries I see most of them are 20C for 1500mAH or 1800mAH. Doing the math I'm coming up with 30 or 36Amps respectivly.
I thought the supercub's stock esc was rated for 24A max? Wont the extended 20C range of the lipos blow the ESC?
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Post by cjg on Jul 28, 2008 4:47:01 GMT 1
if you are running stock motor you should be ok. On the bench at full power mine peaks at 10.5 amps, runs 8-9 amps constant at full power.
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Post by duck9191 on Jul 28, 2008 4:48:40 GMT 1
nope, just means that the battery is capable of delivering more amps then the esc can handle, which is good because you will have less chance of damaging your battery. the battery doesn't really "push" out power, it just delivers whats is needed. you could put a 5000mah 20c battery and it would be fine.
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rbryn
Flying officer
Posts: 13
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Post by rbryn on Jul 28, 2008 14:17:22 GMT 1
ok, that makes sense. . . Time to go spend some money now  |
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Post by 05prostock on Jul 29, 2008 20:08:34 GMT 1
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