E-Flight Power Sources Ask questions or read about power sources as they specifically relate to e-flight including Lithium-ion, Li-Poly, Nimh and Nicad battery packs.

Got Kokams?

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Old 09-23-2003, 01:59 PM
  #1
Greg Covey
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Default Got Kokams?

Kokam USA has released yet another Lithium cell called the 1500HD.

The pre-assembled Kokam 1500 packs represent one of the latest & highest performing Lithium Polymer Batteries from Kokam. With continuous current ratings of up to 12amps & 15+amps in short bursts, the Kokam 1500HC is an excellent choice for Speed 400 class brushless & brushed motors. The Kokam 1500HC may also be used in smaller speed 300 & 280 planes & helicopters when maximum duration is needed and weight is not a primary concern. The 2s2p pack offers the incredible current capacity of up to 24amps with a burst rated to 30amps! Run two 2s2p packs in parallel for extreme run times on larger speed 400 planes & 1/10 scale R/C cars & trucks.

These packs, and many others, can be purchased at [link=http://www.b-p-p.com/Kokam1500HC.htm]Bishop Power Products[/link], [link=http://www.hobby-lobby.com/kokam.htm]Hobby Lobby[/link], and [link=https://www.fmadirect.com/site/home.htm]FMA Direct[/link].
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Old 09-23-2003, 02:08 PM
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Default RE: Got Kokams?

Perhaps the most impressive Lithium cell to date is the new Kokam 340 Super High Current (SHC) cell.

The Kokam SHC battery packs are constructed from the top-performing Kokam 340 20C class cells. All of the SHC battery packs offer extreme performance and are intended for those looking for more performance & faster charge times over standard li-poly cells.

The SHC packs are unique in their capabilities that make them stand out from the crowd. Continuous current loads as high as 20c & bursts to 30C make the SHC packs perform like no others & enable them to outperform packs more than 3 times their size.

They can also be fast charged in 30 minutes, further adding to their capabilities (charge times for most other Li-poly packs are in excess of 1 hour).
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Old 09-23-2003, 02:27 PM
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Default LiPo Gallery

Don Srull's Mig-15 started out as an electric free-flight model using a homemade fan unit (published in Jan. '95 Flying Models). It has a 24" span, and 150 sq. inches of wing area.

As a free-flight model it weighed about 5 oz. With RC added, and a 7 x 270mah NiMH battery it grossed at 6.9 oz. It flew fine for 4 to 5 minutes. He then installed a 2x1100mah Kokam battery and saved about 10 grams. This change resulted in a slight boost in both power and performance, and now turns in flights of 15 to 20 minutes.

For more examples of Kokam Lithium set-ups, visit the [link=http://www.gregcovey.com/li-po_gallery.htm]Li-Po Gallery[/link].
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Old 10-01-2003, 08:41 AM
  #4
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Default Got Kokams?

My Fliton Flubber uses a 3-cell Kokam 1500HD pack that can power motors like a geared Speed 300, Speed 280BB, or Razor 400 brushless motor.

The 4oz pack provides long flight times!
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Old 10-12-2003, 08:11 AM
  #5
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Default RE: Got Kokams?

The 3-cell Kokam 1500HD pack worked great in my Fliton Flubber.

I had long-lasting, powerful flights!
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Old 10-12-2003, 11:53 AM
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Default RE: Got Kokams?

Well, I am certainly one of the few who owns, kokam, TP, ET and CBP li-po cells.
All have their advantages.
Best of all are certainly my kok 340, with 20C.[8D]
1 pack 3S4P weighs 115g and delivers around 30A in my sokol pylon racer, at ~130 mph flat flight. Only problem is the price tag of the pack. If I could, I would only have that type of cell, but i can't afford it as, being so small (340 mA), I would need to stack a lot....
The new CBP cells look very promising (I draw them around 12C)
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Old 10-12-2003, 09:43 PM
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Default RE: Got Kokams?

Any of kokam cell can draw 12c at short burst.
Can you show me the data of your cell at 12 c ,continuous?
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Old 10-13-2003, 12:46 PM
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Default RE: Got Kokams?

Hi JJ
for the CBP850 (new name is Hirate), I have them in 3S2P on a mega 3 turn (switchblade pylon racer). I don't have anything to record on graphs (there are some in the RC group forum) but I have wattmeter and multimeter.
I fly 4'45" motor time (I have also a timer linked to the throttle) for a total flight time of 7'15" (so we are talking more than peaks) and recharged 1420mA. This gives an avg of close to 11C (18A).
These cells, surprisingly, are barely warm after the flight, not like my TP2100 which I can't hold. Fully charged, they outperform the TP2100 pack and a 3S2P ET1200 pack, despite being of a lower wattage. In fact, they deliver slightly better amps and hold better volts too. Roughly, the gain is around 10%, which is noticeable in flight. . Again, this is the confirmation of comparaison graphs posted in the RC Group.
Similarly the kok340, despite drawing close to 18C (24A avg in the flight on a 3S4P pack) are also barely warm. They definitely are the best performers, but a pack retails at 160$...
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Old 10-13-2003, 12:53 PM
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Default RE: Got Kokams?

I'm about to put a 5 pack 3 cell kokam setup into my E3D. This is an upgrade from the Nimh setup I had running. I'm using an Aveox brushless I got from Castle Creations and the Kokam's I got from FMA direct. I believe these are the higher discharge packs and I'm anxious to see how they perform. I only saved an ounce or two in weight but my capacity is more than doubled over the nimh.

I'm going to probably get a flubber as well so I'm going to try the same setup you have in yours.
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Old 10-13-2003, 03:37 PM
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Default RE: Got Kokams?

Hi Mark,

Let us know how your E3D tests out. Your 3s5p Kokam 1500HD pack can deliver 60amps continuous so I think you'll be happy with it.

I used a 5s5p Kokam 1500HD configuration this weekend in my MaxCim-powered Graupner Extra 300S model. The model flew great at only 1/2 throttle!

Here is a photo showing a 3s5p section of it. The other 2s5p section is top side.
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Old 10-21-2003, 09:17 AM
  #11
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Default RE: Got Kokams?

I wanted longer flights on my Pigi 3D and it was an easy upgrade to simply parallel two of my 3-cell Kokam 1500HD packs. I used a portion of one of the Kokam Parallel Connector Modules to plug the two packs together.

My second Kokam pack resides right on the CG line and doubles my flight time by only adding 4oz.
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Old 10-21-2003, 04:28 PM
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Hannu Vuorinen
 
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Default RE: Got Kokams?

Sp400 Stinger equipped with 2s3p 340SHC, many times winning plane in Finnish
SP400 Pylon Cup this year.. Wonder why fuselage in styrofoam box?
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Old 11-02-2003, 02:10 PM
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Default RE: Got Kokams?

My 3.1oz Widget balanced perfectly with a 2-cell Kokam 340SHC pack.

The Firefly-powered Widget has two PS-20 servos and an M5 receiver from FMA Direct. It should fly rock-solid indoors amonst 4-8 other transmitters in close proximity.
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Old 11-04-2003, 12:01 AM
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Default RE: Got Kokams?

Well here is a question for ya, with all these parallel and series battery packs that are sweeping the airways these days,what type of charger are you using and how do you set up charging the different packs you use? Their seems to be all types of cells out there,but not much info on series and parallel charge set ups...I still have the ion charger that I built from Don Post''s schematic in Aug 2000 Mircoflight but I don't think it will be useful in the new li-po world. If there is some where you can send me for information,forums or articles that will educate me, I would sure appreciate it. I'm falling behind... thanks E-Jim
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Old 11-04-2003, 04:07 PM
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Default RE: Got Kokams?

Jim,

I prefer to use a dedicated Lithium charger like the Kokam Lipo-402 or the SC2 from Bishop Power Products.

The 1s to 4s setting and current limit setting is configured via jumpers.
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Old 11-07-2003, 04:44 PM
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Default RE: Got Kokams?

Thanks for taking the time Greg, and for the info on your page,
EVERYONE CHECK THIS WEB PAGE , great stuff.... E-Jim
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Old 11-14-2003, 11:19 AM
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Default RE: Got Kokams?

Hi Jim,

Thanks, we can all share our knowledge in these forums. It is a great resource!

Here is another application using the Nippy Black 0808 motor, APC 9x6 SF prop, and a 2-cell Kokam 340mAh pack. The setup draws 4amps at full throttle and the 20C Kokam pack can deliver 6amps continuous.

My home-built foamy bipe is documented in the Foamy forum.
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Old 11-18-2003, 11:21 PM
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Default RE: Got Kokams?

Hello everyone I have a wattage Giles G202 with a Hacker B20-22S motor with the 4:1 gearbox. I"m wondering what type and configuration of LiPoly cells would work good for that plane. I've been told that a 700 mah 3S pack would do the trick but it seems that the motor would draw to high of amperage for that pack to handle. Anybody have any ideas for this setup?
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Old 11-19-2003, 12:53 PM
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Default RE: Got Kokams?

I think you are right. The Kokam 700HD cell delivers a continuous current around 4.2amps and you can draw up to 10amps on your setup with a 9x6 prop. Hacker typically recommends only a 2s Lithium pack on that setup or 7 cells of 720mAh AAA NiMH so the current draw is around 7amps.

I would recommend the 2-cell Kokam 1500HD pack. It can deliver 12amps continuous and will give you a longer flight. It weighs about 2.8oz with connector.

Good luck!
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Old 12-01-2003, 12:56 PM
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Default RE: Got Kokams?

Perhaps my lightest example of Kokam cell usage is the 1oz ready-to-fly Mini Stik from [link=http://www.smallrc.com/dwehtml/iemicro.cfm]Dynamic Web Enterprises[/link].

The little guy balances perfectly with a single Kokam 145mAh cell which provides enough power for a 10 minute flight indoors.
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Old 12-01-2003, 03:49 PM
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Default RE: Got Kokams?

Where did you get the parallel connector module?
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Old 12-02-2003, 01:29 PM
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Default RE: Got Kokams?

You can buy them at FMA Direct or at [link=http://www.hobby-lobby.com/kokam.htm]Hobby Lobby[/link].
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Old 12-02-2003, 04:41 PM
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Default RE: Got Kokams?

Anyone out there, I need to know if you can charge the FMA Lipo's in parallel, I read the instructions and it says not to, but I also got a couple of of TP packs that I was told I can charge in parallel, I really like this packs but the charge time is too long. I like mostly the FMA because of the size and availavility. I got 2 Triton chargers and 1 Super Brain 969 but I had an accident with the 969 that I know was my fault, I also tried the cells from Batteries America but their discharge rate is onlt 3c, I like them to be at least 5c. The best one so far is the Kokam 340 but the charge time is killing me. Any help would be appreciated. Thanks
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Old 12-03-2003, 11:50 AM
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Default RE: Got Kokams?

Yes you can. Reguardless of the brand, if you use them in parallel, you can charge them in parallel. My largest pack is a 4s5p configuration.

Charge the pack (or cell) fully before connecting them in parallel. After your flight, you can charge them in parallel. Use a 1C charge rate.

Good luck!
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Old 12-03-2003, 08:51 PM
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Default RE: Got Kokams?

this is not really news to some -- but after trying many battery combos and frankly wasting too much time --I tried using the 1500 Kokams - on several motors (all brushless - my 4100 and 5400 Himax and my B20S 22 and 26 winds.)
Bottom line - all work for long flight times and propped right -all prduce terrific result for totally unlimited aerobatics including ( yawn ) hovers .
So I called friend Rojecki who has been testing all of the cells by everyone I guess -and here is what I thought was the best setups for 3D 12 oz planes - and also what he thought :
1- forget two cell lipos - except for GWS motors.
2- use 3c 1500 Kokam OR equivelant
3 - for nutso performance, use 3x2 340 Kokam packs
As for the motor- take yer pick - in brushless in this size but go for the lower gearing --5&6 -1 range.
the model - small about 300 squares - 10-13 ozs.
There are plenty of "sorta" good combos - but these just seem to work very hard and fly for long periods.
The B20Sx22 Hacker and the Himax 2015x4100- are about the same animals - both winners - C OR D drives
the B20S 26 is very efficient and on D drive - stays almost cold -yet on the 12x6 - just goes and goes like the prov bunny.
The Himax 2015 x 5400 is a revver -sucks more juice but wow what a motor! D drive a must.also smaller props.
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