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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › 14mz and Sony NPF-570
04-25-2011 04:31 AM  7 years agoPost 21
hootowl

rrProfessor

Garnet Valley, Pa.

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I think I have five. I barely get a few flights before I'm down to 40%. Constantly charging.

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04-25-2011 02:37 PM  7 years agoPost 22
Four Stroker

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Atlanta

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There are newer cells BUT they charge up to a different voltage that none of my chargers do:

http://battery.sanyo.com/en/spec/ion/UR18650ZTA.pdf

A "good" NP-F570 seems to drop about 10~15% per flight.

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04-25-2011 02:56 PM  7 years agoPost 23
Ace Dude

rrProfessor

USA

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I think I have five. I barely get a few flights before I'm down to 40%. Constantly charging.
How old are the packs and have you done a CC discharge to check the capacity?

  

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04-25-2011 03:11 PM  7 years agoPost 24
Phaedrus

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S. Orange County, California

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My packs deliver about 2-1/2 to 3 hours of on time (flying) before hitting 40%. They take another 45 minutes or so to get to 30%, which is the recharge point recommended by Futaba.

Using the backlight or playing music files will shorten that time considerably.

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Go FASST, or Go Home!!
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04-25-2011 04:10 PM  7 years agoPost 25
hootowl

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Garnet Valley, Pa.

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How old are the packs and have you done a CC discharge to check the capacity?
How do I do the discharge? I guess I could use alligator clips in the holes?

Even when new I wasn't impressed with the batteries. I think it's gonny be time for MR DREMEL HAHAHAHAAA

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04-25-2011 04:19 PM  7 years agoPost 26
Phaedrus

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S. Orange County, California

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You can do a discharge by simply turning the TX on. The TX pulls the same load sticks moving or not, so turn off the timer that shuts down the TX and let it run until you hear the alarm (19%). If it is non-2.4 be sure to fully extend the antenna.

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04-25-2011 04:32 PM  7 years agoPost 27
hootowl

rrProfessor

Garnet Valley, Pa.

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And how do you know how much you put in when you recharge? The Futaba charger won't tell you. I guess I would have to hook it up special to my PocketLader as my Cellpro 10s needs balance leads to charge.

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04-25-2011 06:33 PM  7 years agoPost 28
Four Stroker

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Atlanta

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My Bantam BC-6 will do unbalanced charge and discharge of Li. Just discharged my original Futaba from 2/2007 and got 1537 mAh. Good enough for a spare.

One consideration is that the NP-F570 does a continuous balance discharge. When eventually one of the cells goes before the other one, this should bring down the whole back, ring your TX chime, and warn you of doom before the bad cell goes over the cliff on the discharge curve. Of course, if you cycle your packs once a month, you should notice some change before the crash also. I don't think your TX will run on one cell.

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04-25-2011 08:55 PM  7 years agoPost 29
Phaedrus

rrKey Veteran

S. Orange County, California

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I mostly charge my 14MZ packs using the Futaba CR-2500 charger. It shows capacity replaced. I also bought one of the cables for that charger and cut it in two and made up new ends to fit other chargers I have that also show replaced capacity. I rarely use the desktop charger that came with the radio.

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04-26-2011 03:53 AM  7 years agoPost 30
Jim Woodward

rrApprentice

Boca Raton, FL

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I uncovered a frustrating mystery this weekend. I have the standard Futaba wall charger and a Sony charger. I have been using both chargers randomly for several seasons. I have 5 batteries and just received 3 eBay batteries. Irrespective battery, capacity or voltage, EACH battery would occasionally act like it was going bad. Then all of a sudden, it would return to good performance.

Long story short, I finally determined that the Futaba charger is not charging fully, where as the Sony charger will charge fully. I used and charged the 8 batteries with the Sony, then checked them on my Triton with a new home made adapter. Each battery came off the Sony at 8.5v. In the future, I'll charge using the Triton or Sony charger.
Thanks,
Jim

Team Futaba

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04-26-2011 04:48 AM  7 years agoPost 31
Ace Dude

rrProfessor

USA

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I've been meaning to post this solution I've been using for a while now, but have never gotten around to it so now is as good a time as any.

I was looking for a good solution for a while and even purchased a cheap Sony charger on eBay and gutted it and hooking up small set of leads with Powerpole connectors on it. It worked okay.

This solutions works much better. These are called miniature banana plugs and are available from Digi-Key.

http://search.digikey.com/scripts/D...il&name=J458-ND
http://search.digikey.com/scripts/D...il&name=J457-ND

They fit the jacks on the NP-570 batteries perfectly if perhaps a bit too snug. It used a duckbill pliers on the banana plugs to just slight compress them so they slide with just the right amount of tension on the the jacks on the NP-570.

  

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04-26-2011 04:58 AM  7 years agoPost 32
Ace Dude

rrProfessor

USA

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Long story short, I finally determined that the Futaba charger is not charging fully, where as the Sony charger will charge fully. I used and charged the 8 batteries with the Sony, then checked them on my Triton with a new home made adapter. Each battery came off the Sony at 8.5v. In the future, I'll charge using the Triton or Sony charger.
Older LiIon cells had a max charge voltage of 4.1v/cell. On the back of the NP-F570 it states 7.2v while the genuine Futaba battery states 7.4v. This would lead one to believe the Sony NP-F570 should only be charged to 4.1v/cell. However, I also have a Sony AC-VQ1050D and all the specs (Sony website and included manual) say it's 8.4v.

  

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04-26-2011 05:00 AM  7 years agoPost 33
Ace Dude

rrProfessor

USA

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I guess I would have to hook it up special to my PocketLader as my Cellpro 10s needs balance leads to charge.
I don't know about the Cellpro 10s, but my Cellpro Multi4 and PL8 will charge 1-2s unbalanced.

  

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04-26-2011 04:24 PM  7 years agoPost 34
Four Stroker

rrElite Veteran

Atlanta

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Does anyone make 2.5 mm bullet connectors ? That's what the NP-F570 actually has.

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04-26-2011 04:33 PM  7 years agoPost 35
Phaedrus

rrKey Veteran

S. Orange County, California

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http://aircraft-world.com/shopexd.asp?id=6125

This cable plugs into the TX back. Cut it in two pieces and solder whatever plugs you need to connect to you charger of choice:

http://www3.towerhobbies.com/cgi-bi...p?&I=LXPHL6&P=7

AMA Leader Member
Go FASST, or Go Home!!
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04-26-2011 04:53 PM  7 years agoPost 36
Four Stroker

rrElite Veteran

Atlanta

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Yeah, I already have one of those for charging in the TX.

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04-26-2011 04:57 PM  7 years agoPost 37
Ace Dude

rrProfessor

USA

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Does anyone make 2.5 mm bullet connectors ? That's what the NP-F570 actually has.
The miniature banana plugs are 2.64mm and are a perfect fit as the contact tension is low and can be easily adjusted.

http://emersonconnectivity.com/OA_M...-1081002001.pdf

  

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04-26-2011 05:03 PM  7 years agoPost 38
Ace Dude

rrProfessor

USA

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This cable plugs into the TX back. Cut it in two pieces and solder whatever plugs you need to connect to you charger of choice:

http://www3.towerhobbies.com/cgi-bi...p?&I=LXPHL6&P=7
I obtained one years ago before Tower carried it as a separate product, but I've never used it. I have no desire to charge/cycle through the TX. The miniature banana plugs work great and don't tie up the radio. I use Powerpole connectors on all my test leads so with multiple leads I can charge/cycle multiple packs at once or cycle a pack on my CBA II.

  

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HomeRC & PowerAircraftHelicopterRadio - Futaba FASST › 14mz and Sony NPF-570
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