stunthanger.com
Electric Stunt => Gettin all AMP'ed up! => Topic started by: Paul Taylor on March 28, 2014, 07:35:46 PM
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Anyone have any experience with this unit?
I read about the features and one thing it does is balance the cells. I noticed that I always have one or two cells that are off just a tad. So picked one up from Tower.
I have a 3000 mha 4s battery. After a flight the batteries read as follows.
Total voltage - 14.7
C1-3.71
C2-3.71
C3-3.71
C4-3.67
The device also has a percent meter. It reads 12%. So this says I have 12% of 100%. This concerns me.
Do I need bigger batteries? Flight time is 5:30.
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I think the mah's put back in during recharge is a better guage to measure the percentage depleted. Have you checked this number after recharging. As long as you aren't putting more than 2400 mah in during recharge then you should be fine. The hitec tool is handy for making sure you don't fly with a discharged pack, but the percentage number it displays may not be completely accurate.
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these are pretty vague as to usefullness, I have a similar tool,, if you measure right after flight,, then again 15 to 20 minutes later you can see a difference,,
I basically only use mine to make sure I am installing a fully charged pack,, beyond that they are of limited benefit,,
as was mentioned,, the charger readings are more valid,,
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Thanks Jason and Mark
When I connect to the charger it pickups charging at about what the checker says is in each cell and takes it to 4.20 per cell and a total of 16.# v
So help me out with the math 80% of 16 is about 12.8 - so if my remaining voltage is 14.# I am a little more then 80% remaining capacity in the pak.
Go to go?
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In addition to the battery voltage, your charger should also display a number with Mah beside it while charging. This is the number to go by and this would be the number to base the 80% factor on. Your packs have a total capacity of 3000 mah, so 80% of that would be 2400. If the mah number after recharging is greater than 2400 then you probably need a larger capacity battery. There are others on here that can explain this better than I, but I hope this helps a little!
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Hey Jason
Just put a battery on the charger. It restored 2345, so under 2400. #^
Now I should be good to go???
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That's good but close to the border. Depending on the wind and extra maneuvers and what timer/settings you use ect. your battery could dip down lower. I wouldn't be concerned but it's something to look at after different flights.
MM
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Thanks.
Im also thinking to shorten the time 10 seconds.
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The 80% rule is just a guideline for so called maximum life out of a battery just the same as your 3000mah battery isn't exactly 3000, it may be 2950 or 3050. If you use 78% or 82% I doubt its going to make much difference in the life of the battery. I bet an occasional 85%-90% doesn't matter much either.(I wouldn't do it every time but I do know of one person who does) More than one of us has used the same battery twice by accident and we have not suffered any ill effect from it.