Need to understand batteries

carr52 · Posted: Mon Jan 23, 2012 12:28 am Post subject:

Cool, so I just charge at whatever the battery size is. Thanks.

Tm
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Esky Big Lama
Blade-MSR-X, Blade-MCX, Blade MCPX,
Xieda-9958, E sky-Nano
DH 9100, Alot of Syma's
Novus 125 FP

nick_onelove · Posted: Mon Jan 23, 2012 1:21 am Post subject:

Yeah but the mCPX batteries have a fairly high C rate, I think they can handle 0.7A no problem.

That's what I've been charging mine at for almost a year now anyway.
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Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

carr52 · Posted: Mon Jan 23, 2012 2:21 am Post subject:

I know with the batteries in my solar panel setup a slower longer charge seems to be better and they have never let me down. Using that theory if I charge my li po batteries the same way it is better?
Tom
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Esky Big Lama
Blade-MSR-X, Blade-MCX, Blade MCPX,
Xieda-9958, E sky-Nano
DH 9100, Alot of Syma's
Novus 125 FP

nick_onelove · Posted: Mon Jan 23, 2012 6:07 am Post subject:

It's possible, but I think any benefit would be negligible and not worth the increased charging time 0.2A would take. You understand the concept now, you can decide for yourself what's best for you.
_________________
Align: Trex 250 3GX + Trex 450 Pro with Vbar
Blade: 450 X, mCP X, 120 SR, mSR X, CX3, mCX2
Esky: Belt-CP X and V2 - Futaba: Heli-Max Axe 400
Walkera: V500D01, M120D01, V100D08, DEVO 8
Spektrum: DX8 - AMA #967873 - IRCHA #4095

carr52 · Posted: Mon Jan 23, 2012 6:32 am Post subject:

Yeah I believe I do. I want to thankyou guys.
Tom
_________________
Esky Big Lama
Blade-MSR-X, Blade-MCX, Blade MCPX,
Xieda-9958, E sky-Nano
DH 9100, Alot of Syma's
Novus 125 FP

dasBlade450 · Posted: Mon Jan 23, 2012 5:48 pm Post subject:

FWIW...the mCPx manual RECOMMENDS the stock batteries be charged @ .7A -- the maximum charge rate offered by the stock charger (~2.5C)....
AVERAGE charge/recharge time is 20-25 minutes....I learned yesterday - the HARD way - DON'T go to a fly-meet with just TWO 1S batteries!!! I spent more time waiting for my batts to charge than I did FLYING!!! Crying or Very sad

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I'd Rather Be FLYING my Blade!

carr52 · Posted: Sun Jan 29, 2012 11:12 am Post subject:

I know I'm probably being a pest for asking so many questions but I was really flying a lot today and I always try to rotate my batteries so I don't use one more than the others but With as many charges I have been doing to these batteries can I damage them by flying too much in one day? I always let them cool down before I recharge and let cool down before I use them after a charge. But I've noticed that my flight time is much shorter now. I checked the motor and it is a little warm but not hot. After about 2 to 3 minutes the MSRX just slows and goes to the ground gently like it's running out of power. Again I'm sorry for asking so many questions.
Tom

Update: Well got that figured out. The stock battery that came with the MSRX has died. It charges but gives out after about one minute. If I unplug it then plug it back in it will go another 30 to 60 seconds then give out. This doesn't happen with any of the other batteries. I have to assume it's done for.
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Esky Big Lama
Blade-MSR-X, Blade-MCX, Blade MCPX,
Xieda-9958, E sky-Nano
DH 9100, Alot of Syma's
Novus 125 FP

tombo242 · Posted: Mon Jan 30, 2012 6:09 am Post subject:

You're right there Tom,

The internal resistance of that battery has risen to the point of "No more Flying - I need to Retire NOW!"

Discharge it as much as possible - cut the leads off, 1 wire at a time. (A short can still be dangerous.) Keep the leads, they're always handy and drop the battery in a salt solution for a few days. It is then safe to dispose of.

Tom.
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Keep Smiling Smile

carr52 · Posted: Wed Feb 08, 2012 9:37 am Post subject:

I just read the post about saving the leads off the battery. Thats a great idea. I also agree that caution is a must with lipo batteries. Thanks tombo.

Tom
_________________
Esky Big Lama
Blade-MSR-X, Blade-MCX, Blade MCPX,
Xieda-9958, E sky-Nano
DH 9100, Alot of Syma's
Novus 125 FP