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BrianG · 05.28.2009, 09:31 PM

lol, it may be a bit daunting to a newb, but it's not that bad unless you get really deep into it. We're just trying to say that it may be difficult to get 30 minutes on a 4s pack depending on various factors. It's not simply how much mAh your battery has, but the voltage, motor kv, gearing, drive style, weight, etc.

Personally, I was able to get over 40 minutes on 4s 8Ah with a Neu 1512/2d geared for ~40mph, but that was on a buggy. I always felt it was too heavy with those batteries, but I wasn't specifically looking for 30 minutes either.

Be careful about buying used lipos, or if they are too-low priced, unless you know how they were used (or abused). Were they balanced all the time? Were they ever used close to or over their max current rating? You usually get what you pay for. But, two 4s 5Ah in parallel would be 10Ah total. Should be plenty for 30 minutes.

Also, what kind of track is this? Is it big with lots of straights and not many turns? If so, setting it up for ~35-40mph would be advisable. If the track is small with lots of tight corners, set it up for ~30mph because you'll never hit top speed and the lower gearing will be more gentle on your batteries (and increase runtime). No matter what, use gentle throttle to keep the current bursts down.

	(#22)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	05.28.2009, 09:31 PM lol, it may be a bit daunting to a newb, but it's not that bad unless you get really deep into it. We're just trying to say that it may be difficult to get 30 minutes on a 4s pack depending on various factors. It's not simply how much mAh your battery has, but the voltage, motor kv, gearing, drive style, weight, etc. Personally, I was able to get over 40 minutes on 4s 8Ah with a Neu 1512/2d geared for ~40mph, but that was on a buggy. I always felt it was too heavy with those batteries, but I wasn't specifically looking for 30 minutes either. Be careful about buying used lipos, or if they are too-low priced, unless you know how they were used (or abused). Were they balanced all the time? Were they ever used close to or over their max current rating? You usually get what you pay for. But, two 4s 5Ah in parallel would be 10Ah total. Should be plenty for 30 minutes. Also, what kind of track is this? Is it big with lots of straights and not many turns? If so, setting it up for ~35-40mph would be advisable. If the track is small with lots of tight corners, set it up for ~30mph because you'll never hit top speed and the lower gearing will be more gentle on your batteries (and increase runtime). No matter what, use gentle throttle to keep the current bursts down.