Originally Posted by init4fun

Hi John , im not computer savvy enough to know how to post links but if you search "Radical RC" thats who I get my A123 batterys from and they are a great company to do business with . An A123 is kinda like a lipo but safer and able to be used to power a receiver without any regulators or other devices . They are the best power source to use in our glow engined planes because they dont have the internal resistance problems of NIMH . Just make sure you get ones called "receiver packs" and charge them properly and you will be amazed at how well they work . Best of Luck to you and Happy flying

Thanks for information. I will check into it.

YES !!! I just figured out how to cut and paste a photo . These are A123s that Hobbypartz.com sells and there also a good seller . Good Luck

Originally Posted by init4fun

YES !!! I just figured out how to cut and paste a photo . These are A123s that Hobbypartz.com sells and there also a good seller . Good Luck

I checked it out.

If the receiver pack voltage is 6.6V nominal, can it be used with a receiver and servos without voltage regulator to reduce it to 4.8V?

I was always wondering what happens if I used 2 cell LiPo at 7.4V with a receiver and servo.

Originally Posted by John Kim

I checked it out.

If the receiver pack voltage is 6.6V nominal, can it be used with a receiver and servos without voltage regulator to reduce it to 4.8V?

I was always wondering what happens if I used 2 cell LiPo at 7.4V with a receiver and servo.

If your servos are rated for 6.0V, then it's fine to use 2 Cell Li-Fe (A123) without a regulator. You can't use 2 Cell Li-Po's w/o regulator because their voltage is too high for most servos.

Adrian

Yep , Adrians got it right ! As long as you use 6 volt rated servos A123 is the single best power source available {in my opinion }. Just get rid of anything that says "4.8 volts only" and you will do fine with A123 . Best of Luck to you and Happy Flying

I've been flying A123 and LiFePO4 cells for a couple of years now and wouldn't go back to NiMH or any other battery technology.

They're cheap, tough as boots, have very low internal resistance, a life of 1,000-2,000 charges and can be recharged much faster than most other technologies.

No regulators required either which eliminates yet another point of failure.

Originally Posted by codezilla

If your servos are rated for 6.0V, then it's fine to use 2 Cell Li-Fe (A123) without a regulator. You can't use 2 Cell Li-Po's w/o regulator because their voltage is too high for most servos.

Adrian

Hi Adrian,

Thanks for good advice. I didn't know Li-Fe voltage is lower than Li-Po.

Originally Posted by XJet

I've been flying A123 and LiFePO4 cells for a couple of years now and wouldn't go back to NiMH or any other battery technology.

They're cheap, tough as boots, have very low internal resistance, a life of 1,000-2,000 charges and can be recharged much faster than most other technologies.

No regulators required either which eliminates yet another point of failure.

Xjet, have you been using non-A123 LiFePo4 cells? What has been your experience with the Non-A123 cells. Are the soft cell LiFe's (like a LiPo) as good as the hard A123 cells? I use and love my A123 1100 2 cell reciever packs but I can see a future need for different physical sizes. All the advantages of the A123 cells in different cell configurations would be great. Wish A123 made a few more different cell sizes! Rudy

Originally Posted by XJet

I've been flying A123 and LiFePO4 cells for a couple of years now and wouldn't go back to NiMH or any other battery technology.

They're cheap, tough as boots, have very low internal resistance, a life of 1,000-2,000 charges and can be recharged much faster than most other technologies.

No regulators required either which eliminates yet another point of failure.

XJet,

Do you buy LiFe cells from Chinese source you recommended me for LiPo before?

If not. where do you buy it?

John..you wasted my time and others researching Futaba 9C Supers and then bought a used 9c (not super) from a "friend". Then you claim a crash caused by XPS equipment and cause all sorts of fuss. You must indeed crave attention. Good to see you are getting it.
Now you are also getting an education on batteries while not doing any research yourself. Whatever works I guess, but I have to question someone who is on this forum shopping for a radio, then using XPS equipment who hasn't even heard of alternatives to 4 cell nimh or nicd batts.
Is this really true?
Oh BTW I am another who has used XPS, including the original stubby antenna on the TX. I have flown equipment over land and water until it was a speck and brought it back without incident to fly again. I did it with 4 cell packs but eventually have switched to 5 cell or A123 packs, just to be sure. For curiousity I also flew Spektrum and now Hitec, with exactly the same trouble free results.

John,

Hope this helps: http://hangtimes.com/a123_batteries_for_giants_faq.html

Doug.

4*60

Check your PM's.

Originally Posted by 4*60

Oh BTW I am another who has used XPS, including the original stubby antenna on the TX. I have flown equipment over land and water until it was a speck and brought it back without incident to fly again. I did it with 4 cell packs

Then clearly John's problems were unlikely to be the result of using a 4-cell pack.

Thanks for this useful information

Originally Posted by Rudy F

Xjet, have you been using non-A123 LiFePo4 cells? What has been your experience with the Non-A123 cells. Are the soft cell LiFe's (like a LiPo) as good as the hard A123 cells? I use and love my A123 1100 2 cell reciever packs but I can see a future need for different physical sizes. All the advantages of the A123 cells in different cell configurations would be great. Wish A123 made a few more different cell sizes! Rudy

I was buying the 1350mAH cells from DealExtreme for a while but they seem to have changed suppliers and although the old ones were excellent (although nowhere near as good as true A123s) and I have them in half a dozen .40-sized models, the new cells from that source are now a different colour and have very poor performance (extremely high internal resistance so no good for receiver packs).

I haven't tried the LiPo form-factor LiFePO4 packs but the price on them needs to come down a bit (IMHO) to match the A123s.

XJet, have you seen these? LiFePO4 Rechargeable Single Cells (1C-15C Rate)

The 26650 (3400mAH) in looks interesting.