RunRyder RC
 9  Topic Subscribe
WATCH
 3 pages [ <<    <     1      2     ( 3 )    >    >> ] 7193 views POST REPLY
HelicopterRadio - Futaba FASST › 14mz battery options
04-12-2015 07:03 PM  34 months agoPost 41
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

Well I got some of the new Panasonic 3200 cells RAW UNPROTECTED (no circuit board on one end) from a place called Battery Junction. They came promptly. After testing they are 2900 mAh down to 3.0 volts at 1.5 A and 3000 mAh down to 3.0 volts at 500 mA - more like a TX. As always the capacity is exaggerated. Did not get 3200~3400 ever.

They solder quit easily like the old Sanyo A NiCD cells. I never found a legit place with tabs !

PM  EMAIL  GALLERY  Attn:RR  Quote
08-17-2015 12:11 PM  30 months agoPost 42
wjvail

rrKey Veteran

Meridian, Mississippi

My Posts: All  Forum  Topic

Alright... I'm considering another path.

Seacraft makes an auxiliary battery holder that uses the charge port on the back of the TX to connect a 2S LiPo.

See here for a pictorial of what I'd like to try -> http://www.singahobby.com/?q=node/30544

Because this is a prepackaged solution I have no reason to doubt it will work. On the other hand, I'm concerned that we are plugging a 2S battery into the transmitter port that was designed for an intelligent charger. The charge port on the back of the 14MZ is for the Futaba CR2500 charger.

Is there some circuitry in the the transmitter that takes voltage from this port and uses it to charge the internal battery and power the transmitter?

Does anyone have any experience with this?

Bill

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
08-17-2015 01:18 PM  30 months agoPost 43
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

The port on the back is directly connected to the battery connectors inside. BUT the connector on the back is not really that secure !

PM  EMAIL  GALLERY  Attn:RR  Quote
08-17-2015 03:28 PM  30 months agoPost 44
wjvail

rrKey Veteran

Meridian, Mississippi

My Posts: All  Forum  Topic

The port on the back is directly connected to the battery connectors inside. BUT the connector on the back is not really that secure !
Thanks for that Four.That's the second time this week you've responded to one of my posts with really helpful information. Out of curiosity, how do you know that the charge port leads go straight to the battery?

The fact that this connection is not that secure is one of several problems that makes the Seacraft solution less than ideal. In addition to the unsightly, fragile, and poorly secured wire dangling out the back, I doubt the TX balance will be acceptable and I also doubt the TX fits in its case. I'm sure there are other issues I haven't thought of yet.

Even with these limitations, I'm pressing forward with this solution. I keep my 14MZ around for it's backwards compatibility with PPM and PCM and I use it as a backup for my 18MZ on 2.4 when or if it needs service. The problem is that I don't use the 14 very much and every time I do pull it out of it's case, the batteries are jacked up. I spend a day figuring out which batteries I just hate and which batteries to throw away.

Yesterday was the last straw. I took my son's 15+ year old PT-40 trainer out for old times sake (I got it for him when he was 10. He's 29 now). It was very relaxing sitting in a chair with the antenna pulled up with a light breeze blowing the little red ribbon around. The Thunder Tiger GP42 was just purring along. Now that's old school.

As I said, all very relaxing - except for the battery alarm barking out of my $2,000 transmitter. I charged several packs before I left the house. By the time I slipped a pack into the TX at the field it was 50%. After one 15 minute flight it was 28%. At the end of a second 15 minute flight it was alarming. Pause relaxation while I land and put another battery in.

Any nostalgia and relaxation was immediately and exactly offset by my rage at my backup transmitter that never came with a acceptable battery. It occurred to me during my bouts of changing batteries, cussing, and throwing things that somehow the 18 battery lasts for weeks. The 18 turns out to be a very acceptable $3,000(!) solution to the 14s battery problems.

I'd sell this POS except I like the PPM/PCM capability and I like the fact that it is a very capable backup to my 18. Add in the fact they are not selling for very much used and I think I'll keep it around.

If in fact the charge lead goes to the internal battery as you say, it should be sufficient to keep a fully/partially charged internal battery in the TX. If the external lead becomes disconnected, the internal battery should seamlessly power the TX and the low voltage alarm should still alert.

Bill

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
08-18-2015 11:13 PM  30 months agoPost 45
Four Stroker

rrElite Veteran

Atlanta

My Posts: All  Forum  Topic

I had a 12Z with same plug. I verified the wiring long ago. The peak charger will not operate properly if there is any circuit between it and the battery.

As I recommended earlier in this thread, I recommend getting some new Panasonic NCR18650B 3200 cells and soldering a pack together with a servo connector on it - with white center tap. Hack the 14MZ to install the female plug - no white wire. It's out of warranty. Make a cable to balance charge.

I got some from Battery Junction. They came and were as advertised. Another place was not legit. They solder easily. The original Sony are apparently not available. If you find one it is very old stock.

PM  EMAIL  GALLERY  Attn:RR  Quote
11-02-2015 09:11 AM  27 months agoPost 46
parksi

rrApprentice

England

My Posts: All  Forum  Topic

I fitted a 2s 2600 mah lipo into the battery compartment and its a good fit ..
however i did need to do some dremel work to the plastic to make it fit perfect.

i soldered a futaba connector onto the +/- prongs in the tx and the gensace lipo already had the futaba connector ..
i just sold my charger and original tx battery as i have 2 lipos that will last days instead of hrs ..
Genace lipo is 90x33x14....

PM  EMAIL  Attn:RR  Quote
WATCH
 3 pages [ <<    <     1      2     ( 3 )    >    >> ] 7193 views POST REPLY
HelicopterRadio - Futaba FASST › 14mz battery options
 Print TOPIC  Make Suggestion 

 9  Topic Subscribe

Sunday, February 18 - 10:11 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online