New 4200mAh cell debuts this mounth

[Dafni]

Good NiMHs are just as expensive as Lipos. And here on the forum are a few guys who used them for quite some time without any problems. If something happens, like a pack going bad, it's mostly the users fault. (let's knock on wood, all together :) )

[nbcaznmaster]

True, the
impulse Impulse 14.8v 3200mAh 16C Li-Po cost like 120 (metalman lipo). its 20 bux more than nimh. If u put 2 of them lipos it'll be 2200 more mah with a lil more volatage and better perfomrance. NOt to mention alot lighter.

..and a 4200 mah 7.4v pack from maxamps is $77 (with my reseller's account it's $65 :P), and compare it to a side by side 4200 mah 7.2v IB nimh pack, which is $100. Similiar specs, but the Lipoly pack is CHEAPER than the nimh pack :eek:

[Nick]

Originally posted by nbcaznmaster
True, the
impulse Impulse 14.8v 3200mAh 16C Li-Po cost like 120 (metalman lipo). its 20 bux more than nimh. If u put 2 of them lipos it'll be 2200 more mah with a lil more volatage and better perfomrance. NOt to mention alot lighter.

No... you don't get more capacity from adding more cells.

A 3200mAh Lipo is 3200mAh, 1 cell or 10 it doesn't matter.

[squeeforever]

he ment a second pack in parallel i think, since there 4s.

[Nick]

Parallel would only allow more amps though, not capacity?

[nbcaznmaster]

lol, really? I thought SERIES combined the volatage, and parrellel DOUBLES the runtime

[coolhandcountry]

2 4200 packs in parrellal is 8400 mah.

[squeeforever]

yup, parallel doubles amps and capacity while still the voltage still remains the same as where series only doubles the voltage.

[MetalMan]

Originally posted by E-Traxxer
..and a 4200 mah 7.4v pack from maxamps is $77 (with my reseller's account it's $65 :P), and compare it to a side by side 4200 mah 7.2v IB nimh pack, which is $100. Similiar specs, but the Lipoly pack is CHEAPER than the nimh pack :eek:

Or, through my way it's only $59! Or, if the cells were bought loose, and assembled at home, it would be $55!
Not only would it be at this price, but it would also be at half the weight or even less!

Originally posted by squeeforever
yup, parallel doubles amps and capacity while still the voltage still remains the same as where series only doubles the voltage.

The voltage will be higher because there is a greater amp handling capability.

[nbcaznmaster]

i am even more confused....lol! will teh volatage be higher by ALOT or just a little? So if i ran two 16 cell packs in parrelel, it'll void teh 9L warrenty cuz the volatage is stil higher? Could they do that? lol, im not sure wut u mean.

[coolhandcountry]

It will only be a little higher. If the motor is drawing 60 amps from the packs in parrellal. Each pack only has to deliver 30 amps a piece.

[Batfish]

The better way to put this may be: the voltage drop will be less under load, therefore operating voltage will likely be higher when using batteries in parallel. Initial voltage will NOT be higher.
For example (I know these numbers aren't perfect, so bear with me):
If you have a single 6-cell 3300 pack running at 7.2v and you stab the throttle - the voltage may drop to 6v during the immediate accelleration, then rise back up to near 7.2v. You've got 6 cells pushing the requested power.
If you have two 6-cell 3300 packs wired in parallel at 7.2v and 6600mah and you stab the throttle, the voltage may only drop to 6.5 volts, which means you'll get better power. Here you have 12 cells pushing the requested power, so they don't have to work as hard as just 6.

Of course, then you have to figure in the weight gain from parallel packs. This is why you almost never hear of nimh running in parallel; the weight will probably cancel out the benefits. However, the lipo world of light weight cells now has made parallel connections a reality, so we're hearing a lot more about it now.

Hope that helps :)