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Century Radikal E640 - Swift 16 NX
› Thunder Power 1300's?
06-02-2004 08:41 PM  13 years agoPost 1
Airmicro

rrApprentice

Roanoke, Va

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I just ordered the TP1300 3s from Hobby Lobby for $49.00. I think thats a decent price and it comes with the connector installed (no biggie) I've read these are awesome cells, hope so. I have a MRC Super Brain 969 that will charge Li-po's. I haven't used Li-po's in a while, so I was thinking 1.3 would be the charge rate, or should I just do 1.0 to be safe? What are you guys charging these TP 1300 3s packs at?

When my HB w/ 8cell 750Sanyo's gets low in flight, the edf40h tail has a hard time keeping up for about the last minute of flight, so I know to land! Will these TP's give me an indication like that too before they let the Heli just fall?

The only time I messed w/ the Li-po's is when the Kokam's first came out and you had to assemble the packs yourself and set the Heli down about every 6 minutes or so to let them cool and rest, then you could go back up for another 6 minutes or so, etc. They had terrible discharge ability!

Hummingbird V2
Razor V2
Phoenix 10
EDF40H tail
Trec tail esc
TP 1320 3s

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06-02-2004 09:05 PM  13 years agoPost 2
pbmax

rrKey Veteran

Olympia, WA - USA

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I charge my TP 1300 packs at 600mA, which isn't for safety so much as charge capacity reasons. Lower charge rates give you a better charge. 1.3 should be the max, but even so I rarely charge my 1200 and 1300 poly packs above 1A. No sense stressing them!

Most of the time I don't fully discharge anyways, so charge times aren't too bad.

It might be a good idea to get a poly-safe main ESC if you don't have one already (like the pixie 20p or brushless phoenix 10). That way you can set the cutoff voltage so you don't over-stress the battery. Castle reccomends 7.2v cutoff for 3s poly packs, which under load shouldn't cause any damage (discharging below 3v per cell no load will damage your cells). I've used this setup for a while in my helis w/o ill effects (both etec 1200 3s and TP 1300 3s packs). Setting soft cutoff lets you know when you're out of juice because the throttle starts pulsing.

OR, you can buy a battsignal ( http://www.battsignal.com ) that makes nasty noises when you approach max discharge levels.

You should see the same tail behavior from the poly packs. They don't fall off all at once, but a little quicker than Nimh packs (much slower than nicd!). I've never had a problem with being able to land when I notice the power low (or soft cutoff is hit).

pbmax

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06-03-2004 02:30 AM  13 years agoPost 3
kaptkaos

rrKey Veteran

Miami FL

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The Castle ESC manual has an error, they do not recommend 7.4 cuttoff for 3s lipos, they recommend 9 volts, regardless, I have it at 7.4 and have not experienced any issues. The cells jump right back to like 9 or 10 volts immediately.

I also charge @ 1C

If you give a Chimp a gun, and the Chimp shoots, DONT BLAME THE CHIMP!!!!

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06-03-2004 06:52 AM  13 years agoPost 4
pbmax

rrKey Veteran

Olympia, WA - USA

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Well, whatever. If it's an error in their documentation, why don't they fix it? As of right now the downloadable phoenix 10 documentation on their site still says 7.2v for 3s poly packs. It's real simple to regenerate the .pdf....

pbmax

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Helicopter
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Century Radikal E640 - Swift 16 NX
› Thunder Power 1300's?
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