Battery Draw-Down Rate?

[kacordy]

I have some new 5000/45c Hyperions. I have run twice. Fully charged shows 8.3. I ran 4s for 3 minutes/on a timer at lbasically full throttle. I pulled the batteries, put them on my Hyperion charger and they show 7.7. How do I know where I'm at. How long can I run and did I draw them down to far. I'm new to this and need to learn more and respect the Lipos.

Thanks for your help,

Allen

[JimClark]

when you recharge them how many MAH go back in the battery?

[Fluid]

Knowing the resting voltage after a run is important, as is knowing how much charge you put back in after the run - with fully charged packs. If you know the mAh put back in you can use the OSE calculator to find your average amp draw - as long as you carefully time your runs. Your average was around 50 amps. http://www.offshoreelectrics.com/conversion.htm

The resting voltage also lets you know how far down you drew the packs. A resting voltage of 7.7 volts is 3.85 volts per cell, so you used somewhere near 50% of the pack charge. Don't go below 3.75 volts per cell with a racing setup, that's around 20% remaining. I don't go below 25% remaining, based on the mAh I put back in after running.


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[stevecox]

I'm new to this boat site and just getting into boats just bought 2 fighter cats Dayton's and trying to get this stuff figured out. Its all different from car racing I have seen but as far as car racing we run 2 cell lipos 3200 mah 25c we charge them at 8 to 12 amps and pull them down on a Turbo 35 charger for 240 sec to get our numbers. We cycle them once a week, But on race day we charge them and they peak at 8.40 then we pull them down at 35 amps to 6.80 volts now its very important that you Aldo not go below the 6.80 we have done them all kinds of ways but this is the best I have battery I have been racing for 9 months and there better numbers today than when I bought them. When you pull them down at 35 amps and charge then back up it will lower the internal resistance from like 9.9 and a AV voltage of 7.55 to a 8.5 IR and the AV will be in the 7.60 range a big difference in a race application. Trust me I have run this for a long time and can show you the difference just don't go below 6.80 at any time they will be at 7.60 at the end of a 4 min race and that's where I leave them . If you need a small edge over thd field you can put them on a heating pad while charging them and you will see a lower internal Res. Try this and let me know how it comes out I'm sure you will see a big difference. Good luck

[kacordy]

Jim, they end at 8.32 or 8.4, I will have to check