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HomeAircraftHelicopterMain Discussion › A123 battery for the 700 class macjine....?
03-19-2015 11:03 PM  3 years agoPost 21
Dan Minick

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Columbus, WI

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The prices he came up with are alright. A123 cells do not vary in price much. The lipo you were buying I would not use as a paper weight. Lipo is still the winner in my book.

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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03-19-2015 11:13 PM  3 years agoPost 22
BobOD

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New York- USA

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I'm very interested to see what arguments you have in claiming that A123 packs are even remotely practical or reasonable as flight packs for 700class helis.
Maybe he likes a heavy helicopter with very big, expensive batteries.

Safety...yes, charge rate...maybe, performance...NOT
Although perhaps the safety thing shouldn't be overlooked.
Some would say safety and charge rate are part of performance.

Team POP Secret

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03-19-2015 11:48 PM  3 years agoPost 23
Ace Dude

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USA

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28*74gr = 2072gram pack
$17/cell with a 48C discharge = $476 to wire something like this together
Genuine A123 only $9.25/cell here:
https://www.buya123products.com/goodsdetail.php?i=6
That 28 cell pack is now only $252.

  

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03-19-2015 11:56 PM  3 years agoPost 24
Fauropitotto

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Tampa, FL

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Still heavier, larger, and more expensive than lipo.

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03-20-2015 12:10 AM  3 years agoPost 25
Ace Dude

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USA

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Price depends on which LiPos you're comparing against. The A123's are a commercial grade industrial product for the mass market. Although A123 tried to market them to the RC market they were never intended for the RC marketplace. DeWalt made them famous in the RC community by using them in their 36V drill packs back in the day.

Yes, they don't have the energy density of today's LiPos, but they're still excellent in terms of high current output, durability, and safety in their own right.

  

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03-20-2015 03:04 AM  3 years agoPost 26
Dan Minick

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Columbus, WI

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Genuine A123 only $9.25/cell here:
https://www.buya123products.com/goodsdetail.php?i=6
That 28 cell pack is now only $252.
dang, I was going to order some. Only serve Asia and Middle East

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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03-20-2015 03:12 AM  3 years agoPost 27
Riq

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ND

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I use them in the kids barbie jeeps and such, as well as in a schwinn scooter. They can withstand the kids abuse of overdischarge, and charge fast, and have lasted for years so far.

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03-20-2015 03:39 AM  3 years agoPost 28
Ace Dude

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USA

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See this post with different link. I know he purchased them last year.

https://rc.runryder.com/p6341123/

  

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03-20-2015 06:24 AM  3 years agoPost 29
es1co2bar3

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winnetka california

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I removev the link I don't think I can post it here,

THOSE are folk who with pic of the A123 install on their birds.

The guy that said I need 28 battery to run on the 700 he have no idea about this.

I use the A123 in my 450 and I am telling you the power is unmatched compare to the lipo, don't even think
about the weight you will have so much power you won't
even notice the the Heli is heavy until about 3.5 min
of flight.

The current output of the A123 is higher than the lipo
that why the craziness only lasted 3.5 min while the
LIPO will last about 6 min with 1/3 less RPM than the the
A123 motor power s

the A123 will fly your bird as if it is being Govern.
The only down side it the time to setup the power plant.

but other than that its worth switching for the fun of it. It cheaper and safer.

I was waiting on some honey but there aren't no Queen bee,

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03-20-2015 06:38 AM  3 years agoPost 30
Fauropitotto

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Tampa, FL

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I use the A123 in my 450 and I am telling you the power is unmatched compare to the lipo
I'm waiting to see your math es1co2bar3...

If you can show me an A123 battery build with the specs that can match or exceed the power of a comparable lipo for a set system, and you can present the calculations to back it up, I'd gladly change my mind.

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03-20-2015 12:10 PM  3 years agoPost 31
fenderstrat

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Aston,Pa

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ESCOBAR,if you are gong to just change the subject when you are proven wrong then this discussion should be over.Also a 450 heli and a 700 heli are completely different animals when it comes to batteries.There is a HUGE difference between 3s 2200 and 12s 5000

SHOW the NUMBERS,show what a123 batteries you would use for a 700 and the specs to go with it.Oh and you also just cant pull numbers out of your a$$.

and finally,what is so difficult about setting up a heli with a123,what is so different??

You obviously have not taken the time to do any research and you are arguing with people who have,there is no disputing hard numbers

Many of us also are NOT interested in 3 min flights no matter how much power

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

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03-20-2015 12:39 PM  3 years agoPost 32
Aaron29

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USA

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I see no point in repaving a path the heli community, including pros, has already walked down.

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03-20-2015 12:48 PM  3 years agoPost 33
Einzelganger

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Campbell, Texas

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Question from a nitro flier:

Can an esc be set up to fly a 700 electric bird @ 33.3 volts (9s)?

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-20-2015 01:02 PM  3 years agoPost 34
Dan Minick

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Columbus, WI

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Not the ESC technically, but you could buy a higher kv motor to make up some head speed. Problem with this is you lose major peformance

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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03-20-2015 01:21 PM  3 years agoPost 35
fenderstrat

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Aston,Pa

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there is a whole sub forum here for low headspeed flying.Theres problably a ton of good tips and set ups there.Guys are getting good sport/mild 3D performance with really long flight times.Its mostly about motor/battery/pinion selection

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03-20-2015 01:28 PM  3 years agoPost 36
Funky Trex

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Westerville, OH - USA

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Gotta love when 450 heli logic is applied to 700s (especially when that "logic" is wrong in the first place). It would be great if people actually had experience trying these ideas before posting these theories as "fact". Hopefully anyone considering this idea would go back and search the hundreds of threads that have much better (and correct) information on this subject.

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03-20-2015 07:57 PM  3 years agoPost 37
fenderstrat

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Aston,Pa

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Aaahh a lightbulb just went off,I know what is going on.Escobar either saw in person or on video a guy flying a 450 using a123.He problably just dropped a 4s pack into a heli set up for 3s lipo.So the headspeed was cranking and the heli had crazy power for 3 min.Thats all fine and good for 4 cells but once you get into the big heli range, the size and weight penalty is just too much to overcome.Without doing any research he just assumed it could be scaled up

Compass helis Support Team
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Mini Titan/SE
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03-20-2015 08:08 PM  3 years agoPost 38
BobOD

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New York- USA

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Simple minds are easy to please.
It can be a blessing really.

Team POP Secret

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03-20-2015 08:48 PM  3 years agoPost 39
Four Stroker

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Atlanta

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It's a hobby. Everyone should fly exactly what they want to fly. It looks like a low head speed 700 with maybe an 8S2P A123 would be entirely practical. Is the OS GT15HZ practical ?

I assume the definition of NOT PRACTICAL is that it will not do crack smack maniac 3D.

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03-20-2015 09:17 PM  3 years agoPost 40
Ace Dude

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USA

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Isn't a 700 size gasser a few lbs more than your typical 700 sized nitro/electric? The gasser guys make it work with the additional weight and they swear by them.

As mentioned, it's a hobby and learning and experimenting are all part of the hobby.

  

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HomeAircraftHelicopterMain Discussion › A123 battery for the 700 class macjine....?
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