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07-03-2018 04:31 PM  81 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  81 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  68 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  68 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  68 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  67 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  67 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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07-25-2018 06:44 PM  59 days agoPost 8
Jamovich

rrVeteran

Bangalore, India

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Yes it can reach 120 amps peak during tic tocs. I’m not the only one to have problems with Revolectrix batteries it seems. People that I have spoken to have had a similar experience - lasting only 45-50 cycles.

The Heli is a goblin 630 stock setup.

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07-26-2018 01:42 AM  59 days agoPost 9
Rojoalfa

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Punta de Mata, Monagas-Venezuela

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/
/

Don't worry!
Revolectrix is not a manufacturer. They simple assembly lipo cells in packs and put a fancy label on it...

Wtb, open a lipo pack wasted and check real manufacturer, reading printing on cells.

/

Saludos cordiales,

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07-26-2018 04:39 AM  59 days agoPost 10
Jamovich

rrVeteran

Bangalore, India

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It seems that the batteries are made by Revolectrix

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07-26-2018 11:33 AM  59 days agoPost 11
Richardmid1

rrProfessor

Leeds, England

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I'm sure they are made FOR Revolectrix not BY Revolectrix.

Either way, invest in some better packs. Best 'bang for you buck' are the standard Turnigy's, even the 20-30C packs are good, you just have to check them for balance etc. when you get them, they will exchange them no problem if you are not happy with the balance.

60% of the time, it works every time!

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07-26-2018 11:38 AM  59 days agoPost 12
Jamovich

rrVeteran

Bangalore, India

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Well because of the restrictions on the transportation of lipos the only international company that sell batteries to India is Revolectrix (by bending the rules...putting them in plastic tubs with an LED bulb and calling them flashlights - electronics with batteries are allowed to be shipped). Otherwise have to rely on local dealers (traders...no returns/cutomser service) that manage to import a small selection of lipos at quite a premium....

I did manage to get my hands on some gensace packs so I hope these last.

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07-26-2018 11:38 AM  59 days agoPost 13
Rojoalfa

rrVeteran

Punta de Mata, Monagas-Venezuela

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/
/

Very good.. Now... Is There a way to translate that codes to a date of manufacture?

/

Saludos cordiales,

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07-26-2018 11:52 AM  59 days agoPost 14
Jamovich

rrVeteran

Bangalore, India

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Likely this cell was made on the 18th of September 2017 which is pretty close to the time I bought it (a month or two later). As I fly 3-4 flights a weekend (I have 3 sets of batteries) this would mean 8 months or about 30-40 cycles at the most.

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07-26-2018 01:11 PM  59 days agoPost 15
Richardmid1

rrProfessor

Leeds, England

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What is your timer set for and what voltage are the cells after a flight?

Make sure you aren't charging them in a cool air conditioned room and then taking them outside in hot weather. If you do, make sure you are only charging them to 90%.

What charger do you have?

60% of the time, it works every time!

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07-28-2018 04:24 AM  57 days agoPost 16
Jamovich

rrVeteran

Bangalore, India

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I’m using the vcontrol radio with the battery pack telemetry so I always land with 30% left in pack...thats approx 6 min flight. I was never charging to 90% always to 100%. Always charged at room temperature. I’m going to try with my new packs..4.15v instead of 4.2. Am using a Revolectrix 6pl charger

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07-28-2018 11:55 AM  57 days agoPost 17
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Keep your batteries in this range 30% - 95% and you will get the most from them.
Never leave them fully charged for more than a couple of days. Storage charge them when not in use.
I use the cheap turnigy packs and get well over a hundred flights.

.

spending time, paying attention

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07-28-2018 01:59 PM  56 days agoPost 18
Jamovich

rrVeteran

Bangalore, India

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I always brought them back to storage charge the very same day...I guess if packs are poor quality in the first place nothing much can be done

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07-28-2018 02:01 PM  56 days agoPost 19
Jamovich

rrVeteran

Bangalore, India

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At the price I pay for 2X packs here I would need at least 300 cycles from it to beat the cost of nitro

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07-29-2018 09:34 AM  56 days agoPost 20
Jamovich

rrVeteran

Bangalore, India

My Posts: All  Forum  Topic

So these new gensace batteries have a resistance of total shy of 12mv over the 6 cells (1.6-1.8 mv with at least 1 or 2 cells with 2mv)...hope this is ok?

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