Air Thunder 25C 6S 5000mah Voltage

[mymax]

I have two AT 6S 5000s and after charging them each with my new Hyperion EOS610D, the voltage reading are 22.521 and 22.145.
Is this normal?

I bought these used and I haven't used them yet.

[r40734]

Mine are ~25.2V after charging.

[joehelicopter]

I have two AT 6S 5000s and after charging them each with my new Hyperion EOS610D, the voltage reading are 22.521 and 22.145.
Is this normal?

I bought these used and I haven't used them yet.
The volts will increase after a few cycles..:thumbup:

[Skiddz]

That seems pretty low to me. 22v is about 3.7v/cell which is the nominal voltage. 3.85 is the commonly accepted storage voltage. You should see right around 4.2v/cell when fully charged which would put you at right around 25 volts.

How "used" are these packs??

[mymax]

Kevin,
I am not sure how many cycles have gone through these packs.
The guy I bought them from says about 10.

I have a Thunder Power and that one has a voltage of 24+

I'm hoping I didn't get taken and these packs will serve me. I just don't know right now.
I'm waiting for a servo arm to get this heli together and try the packs.

Thanks

[HPSOV2]

Fully charged the pack should be 25.2v, which may drop to 25.0v after they have been sitting for a while. Any less than that and the pack is not fully charged, or is faulty.

During your charge what did your charger say the voltage was? It should have been 25.2 during the second stage of charging. If not there is a problem with your charger.

If the charger displays 25.2 during charge, and this drops to your 22v once the charge has finished then you may as well throw the packs into the bin now.

[mymax]

I have a new Hyperian 610iDUO charger.
I just placed it back on the charger and it read 22.2.
Just put it back on to check voltage and charge it again.
It was charging at avg per cell 3.7v and total avg of 22.5v-22.7v

I'll let it finish and see what it ends up with again.

These (2) used packs had not been used for about 10 months or so.

[r40734]

It almost sounds like the charger might be set up for A123 Li-Ion batteries instead of Li-Po.

[HPSOV2]

It almost sounds like the charger might be set up for A123 Li-Ion batteries instead of Li-Po.

Well thought of!

mymax- I have the same charger you do, and both channels were set to A123 (Li-Fe) when I first turned it on. Are you familiar with your charger and these settings?
If not I suggest you take some time to ensure you are doing everything correctly, these batteries will explode if you dont charge them right.

[mymax]

No, it's LiPo.
My other exact match pack reads: 22.5v and looks good.

Pack in question after **Complete** charge specs:
25.271
each = 4.21v

But I'm not sure what this means???
CHG C. 1799mAh
PEAK.V 25.289V

Does it mean the pack has only 1799mAh of charge and not the 5000 it's rated at?
Or is it what the charger charged at?

Anyways, it may be good still because it came up from the 22.1v to 25.2+ after the first charge.
But is that too much now???
I will allow to sit awhile and recheck the voltage because that surface voltage was coming down as I was watching it after the charge was complete too.

Thank you for you time!!!

[r40734]

That looks good now. The 25.271 is perfect and the 1799mAh is telling you how many amp hours it took to recharge your battery. This is an important number to watch. You want to experiment with flight times in a way that this number will equal 80% of total battery capacity when the battery is charged. In your case, 5000mAh battery X 80% = 4000mAh. Less is fine, try not to go over by too much.

[Dennisu]

mymax

Air Thunders don't follow the 80% rule and can be used down to about 100% without problems as per battery manufacturers suggestion. Just charge them up and fly until you or the helicopter don't feel like flying. I take 4900 mah+ out of mine all the time without problem. You will love how they work.