LiPo Battery sizes

Paul, where are you located?

Jerr

-- tailskid

Been modeling since '49 - which makes me an Old Fart

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Paul, The Ready to Fly People who buy the ParkZone Strykers, P51s and similar quickly tire of NiMh. They tend to purchase the 3S1800 to 3S2100 and up. This has developed into a sizeable market. Many of the ARF electrics use the

3SXXXX packs as well. Take a spin through RC_Universe, RCGroups and the new Wattflyer.com under the park flyer and similar headings. Let us know when the batteries are on your site.

Tom

Phoenix, AZ.

That's a good size to start, go up from there. In addition to size and discharge rate, the wiring configuration is important to many of us. If you don't offer batteries with taps to each cell, you might find yourself with inventory you can't sell in the not too distant future. If I can't monitor the voltage on each cell, and balance the pack as may be necessary, I don't buy them.

Abel

Thanks for the tip. I can get them with taps but my supplier said that not many people are buying the balancers yet.

You can balance packs without balancers by charging cells one at a time, but you can't do it without the taps. Neither can you use protective charge modules (PCM) that interrupt the charge current when any cell exceeds 4.2 V. Not as techy as balancers, but cheap and a positive safety measure. Nobody in my club uses a pack balancer AFAIK, but most use PCMs.

Abel

As soon as users find that they can significantly extend the service life with balancing chargers coming on the market you will find that the market for packs without taps will significantly decline.

Hi paul.

Sizes that are most used are

2s and 3s about 300-400mAh for small indoor and parkflys,

then pretty much all capacities with about 2:1 ratios on that i.e. 600,

1200, 2400, 4400 all in 2s and 3s.

Then you tend to move into more cells type packs

i.e. 4s-8s will need maybe 3000, 5000, 8000 mA/h

The greatest sales volume is to be had out of the packs 2s and 3s from about 1000mAh to about 3000mAh.

Hey Paul, when did you get back to PHX? Heck I'm up there almost ever

week. Anyway to answer your question, usually a 3s2p battery is th most common saught. 1300, 2100, 3000, and 4000 packs. Electric i really taking off as you can fly these things almost anywhere there i space as noise is not a problem. I've noticed that even the contro line people are starting to jump into electric powered models. The need different speed control setups and the like, but the revolution i coming.

Anyway, glad to hear your home and safe.

Gu

-- starca

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Red, could you explain how these work? I'm looking into purchasing on

for my lipos.

As soon as users find that they can significantly extend the servic life with balancing chargers coming on the market you will find that th market for packs without taps will significantly decline

-- starca

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Guy,

Where the heck are you now?

BTW, electric CL is rather old! About 30 years ago I saw them flying with the control lines supplying the current!

Also, is there a standard connector and configuration or are all the different makers doing their own thing?

the possibles are either

- no connector, let the user do their own.

- supply a range on customer request.

- fit JST to the sub 5A stuff and Tamiya to the 5-20A stuff (not the best, but common) and nothing to the bigger packs in the certain knowledge that those that have preferences will cut them off and fit whatever.

Have a look at

for typical website and connector choices.

-- starca

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Oh Yeah. I remember reading in MA people trying Electric C/L back i

those days. Seems it never went as far as it is today. With mor powerfull motors and Lipo technology today almost anything is possible Now it seems to be looking for a direction C/L'ers will take be it power source running through the lines or a switch on the model with BEC to control the cutoff. It's funny looking back over the las couple of years how far electric model airplanes have come from simpl speed 400's, 500's to brushless motors with lipo's.

Sorry guys, just adding 2 cents

-- starca

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Cox made an Electric Spifire around then. Heavier than the regular 1/2A plastic stuff they had, with IIRC a 280 class motor and a couple 1/3AA nicads crudely charged by holding a lantern batterys terminals against some contacts for around a minute or so

So you had heavy, underpowered and short run time, all the things that the glo fuel crowd(rightfully) held against the early electric attempts.

But did have the one advantage of electrics: Starting easy vs the .049s

Only made for a year or so, with good reason: would barely fly, and the GE nicads didn't last long if overcharged.

Now had they used batteries in the handle and used nylon coated braided steel wire for getting the juice to the motor, it would have done better.

** mike **