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 2 pages [ <<    <     1     ( 2 )    >    >> ] 451 views POST REPLY
07-29-2018 12:16 PM  78 days agoPost 21
Rojoalfa

rrVeteran

Punta de Mata, Monagas-Venezuela

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Internal resistence 1.8 mohm... Very nice... New

15 mohm... Mature

More than 25, getting older and dying...

/

Saludos cordiales,

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07-29-2018 01:45 PM  78 days agoPost 22
Jamovich

rrVeteran

Bangalore, India

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The funny thing about the Revolectrix batteries is that the resistance is still very low...if not lower than the gensace batteries but they have just lost charge capacity...

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07-29-2018 08:35 PM  77 days agoPost 23
Rojoalfa

rrVeteran

Punta de Mata, Monagas-Venezuela

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Wait a minute... mV is one thing... Mohm is Another thing...

You can have a very Good balanced LIPO but still bad.
You can charge a lipo successfully but still bad.

Internal resistance is the key...

After 50 cycles, your LIPO are not the Same... IR increase in such a way, that discharge capacity put your pack on seriuos bad shape.

/

Saludos cordiales,

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07-29-2018 08:38 PM  77 days agoPost 24
JuanRodriguez

rrProfessor

The Villages, Florida

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Jamovich
The funny thing about the Revolectrix batteries is that the resistance is still very low...if not lower than the gensace batteries but they have just lost charge capacity..
Revolectrix batteries have a great reputation from what I read.....

Is there a chance you can charge them on someone else's charger just to eliminate an issue with your charger ???

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

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07-30-2018 01:48 PM  76 days agoPost 25
Richardmid1

rrProfessor

Leeds, England

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I presume he meant Mohm's.

Something's not quite right. A 4400mah pack with IR lower than 2 mohm's per cell should give very good performance and flight time!

Are you sure ALL the cells have roughly the same IR?

Are the packs puffed up when you land?

A 6 minute flight leaving 30% in the packs isn't a very strenuous flight and the packs should be lasting a long time.

60% of the time, it works every time!

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07-30-2018 01:59 PM  76 days agoPost 26
Jamovich

rrVeteran

Bangalore, India

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Yes the performance isn’t the question it’s the capacity...I have done a capacity check multiple times and at least 1 pack only can take in 3000 mah, and the best 3800 (out of 4400) that is 86%...with 80% being replacement time

Battery set 1

A: 3504
B: 3886 (26/5)

Battery set 2

A: 3874
B: 3423 (26/5)

Battery set 3

A: 3806
B: 3000

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07-31-2018 11:18 AM  76 days agoPost 27
Richardmid1

rrProfessor

Leeds, England

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How are you doing a capacity check? You must discharge the pack to 3v/cell slowly (no more than 0.5C) and recharge.

Do you always parallel charge the packs? It is advisable to charge the packs individually every few cycles.

60% of the time, it works every time!

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07-31-2018 11:44 AM  76 days agoPost 28
Jamovich

rrVeteran

Bangalore, India

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I did the capacity check using the “analyse cycle” feature on my Revo touch charger. I also charge each battery individually never exceeding 1 - 1.5C

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07-31-2018 01:11 PM  76 days agoPost 29
Rojoalfa

rrVeteran

Punta de Mata, Monagas-Venezuela

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/

OK... Now, I understand your point.

If you want that your lipo packs last for more than 50 cycles, never discharge above 70%.

IMO, a lipo pack can give safely half the capacity for each flight.

So, for 4400 mah, you just can discharge 2200 mah, hopefully at 3.8 volts.

The other half is not available, just because is below 3.8 volts, not safe.

Doing such a procedure to insist to get more than 80%, you will need more expenses...

/

Saludos cordiales,

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