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07-03-2018 04:31 PM  16 days agoPost 1
Jamovich

rrVeteran

Bangalore, India

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Hi,

Is there any battery pack (12s setup) that will be guaranteed to last 150-200 cycles on a heli that does medium to hard 3D? (Pulling on average more than 100 amps in a flight).

I am using Revolectrix 70C packs and they barely lasted 25 cycles (less than 80% capacity left)...if that is the expectation then glow is significantly cheaper!

Any ideas?

Thanks

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07-04-2018 12:29 AM  15 days agoPost 2
JuanRodriguez

rrProfessor

The Villages, Florida

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Jamovich
Is there any battery pack (12s setup) that will be guaranteed to last 150-200 cycles
Seriously ???? What manufacturer can be guaranteed that the user will not undercharge, overcharge, over discharge or improperly store or abuse their batteries in other ways ????

Been there, done that and old enough to know better.....

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07-16-2018 03:22 PM  3 days agoPost 3
Richardmid1

rrProfessor

Leeds, England

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It's not really about the battery but the users knowledge of setup, how to look after Li-po's and having a decent charger.

Also be careful with working out average flight current draw, 100A average would mean a 2.5 minute flight or less. 60A average is more realistic for a hard 3D flight which works out to only 12C for a 5000mah setup.

I could tell you how to make cheap 20C packs last 150 cycles but it would take too much typing! haha.

60% of the time, it works every time!

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07-17-2018 12:54 AM  2 days agoPost 4
Rojoalfa

rrVeteran

Punta de Mata, Monagas-Venezuela

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/
/

No way... It is like winning a lottery...

Batteries only with expiration date are PB.

Lipo? Manufactures doesn't like to put assemble date.
Either way, builder put some label and plastics and sell lipo hidding important information printed on each cell... You never know what are you really buying ...

So... The only way to get good lipo is buying recently manufactured packs... Very difficult to achieve.

Of course, I would recommend to charge a lipo on the retail store... internal resistant closer to zero, the better.

BTW, sellers would be very angry with such a procedure...

/

Saludos cordiales,

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07-17-2018 11:25 AM  2 days agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Rojoalfa
Of course, I would recommend to charge a lipo on the retail store... internal resistant closer to zero, the better.
That would be great if they'd let you. What I do is check the balance as soon as I get them then put them on a slow charge BEFORE soldering any connectors on. If they don't balance up within 0.05v within a minute or two or have any cells with unusually high IR I send them back!

60% of the time, it works every time!

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07-17-2018 02:35 PM  2 days agoPost 6
doorman

rrProfessor

Sherwood, Arkansas

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Setup??
100 amp draw with mild 3D??
Something seriously wrong in your setup, is what I am thinking.. improper settings on your esc, or wrong pinion, blades too long, wrong motor trying to keep up?? All places I would look at.. do not discharge your batteries to less then 20% after a flight..
Good luck,
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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07-17-2018 04:01 PM  2 days agoPost 7
Richardmid1

rrProfessor

Leeds, England

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See my reply above. I think he means more than 100A peaks in a flight, not average.

For packs to only last 25 cycles something is either wrong with your charger, you are over discharging or there was something wrong with the packs when you got them. Checking your batteries when you get them BEFORE soldering any connectors on and knowing what to look for is a must to ensure you have long lasting packs.

60% of the time, it works every time!

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