I realize this thread is dead, but I had to put in my thoughts after reading.Whetherits Li-po or Ni-Mh doesn't matter when it comes to longevity,butLi-po does give you the ability to draw more current. When you are looking for a battery you need to do the math. As stated in the previouse posts,
well, from my experience, my 1320 mah 11.1 v lipo (running a
Mamba 8000 Kv mind you, as well as an accessory cooling fan) just about doubled the runtime of my 1400 mah
nimh battery. sure the mah are usaully indicitive of longer run times, but when you change its ability to hold, push, pull, and drain power, you also change your expectations of the mah.
so, long story short: my 1400 mah, 7.2v battery, lasts ~ 20 minutes on a decent charge.
my lipo ~ 40 minutes on a decent charge.
my lipo is easily 3 times faster than my nimh!!!!! the car is uncontrollable!! and i love every second of it.
Thedifference inrun-time comes from the actually capacity of the batteries.To measure capacity you need to use watts/hour.
Watts = Volts * Amps
7.2v * 1.4ah = 10.08Wh
11.1v*1.32ah = 14.652Wh
A difference of 4.572 Wh, the Li-po actually has more capacity.
Run time is calculated as follows
if you get 20 mins of constant runtime with the NiMh then you use 0.504Wh per minute
if you get 40 mins of constant runtime with the Li-po then you use 0.3663Wh per minute
There seems to be a little bit of exageration here, as you obviously pull more current with the Li-po, my guess is it's not a constant runtime.
I belive you
I was over-exagerating a bit. But the thing is - I want long running time, my 1/18 buggy goes fast enough as is. So which
battery should I get? Everywhere I read LiPo in 1/18 buggy only have like 1400Mah. Wouldn't it give
a lot less runtime than 2500Mah AA? Long runtime - that's what I am after. So what battery should I get? <span class="info">
If you are looking for runtime only and not speed, then type doesn't really matter. Just do your math, and if you use a Li-po watch the throttle.
This is more for those that are researching batteries and stumble upon this thread.</span>