(Message edited by woody on May 16, 2007)
(Message edited by woody on May 16, 2007)
Yup, the Xtrema looks good.
The Astroflight 109 Lithium charger also apparently now handles A123 M1 cells. It costs $120. Around £90 in UK model shops.
What NiCads are you using Gary? We just did another test with the Lithiums, running THz round on a nice grippy tarmac carpark for four mins, doing a fair bit of heavy pushing. Pulling up to 150 amps (briefly). And we accidentally only had three out of the four Lithium packs connected. They were only warm at the end.
With the A123 Lithiums, you will dramatically shorten their life if they get over 60 degrees C.
You should connect a 100 amp shunt (or a whattmeter - http://www.westlondonmodels.com/product1836/Astro-Super-Whattmeter/http://www.westlondonmodels.com/prod...er-Whattmeter/ or http://www.alshobbies.com/shop/lookupstock.php?pc=4870http://www.alshobbies.com/shop/lookupstock.php?pc=4870) to your battery pack to see what sort of currents you are drawing.
Just for my frame of mind, are the A123 cells under FRA rules now allowed in heavies or not?
Because for now it stated ALL lithium based batteries are allowed up to featherweights only.
From experiences they have had with the Victor speed controller in the states, it would seem that it is quite hard to get a fan to survive inside a robot. And those are only 40 mm fans.
No, Lithiums batteries of any type are not currently cleared for use in heavyweights.
We have been chosen as one of the teams to evaluate them for use in heavies.
Gary - note the Astro whattmeter only handles up to 70 Amps, which may not be enough for your needs. Pity those poor NiCads....
(Message edited by terrorhurtz on May 16, 2007)
the nicads that i have currently have are the Sanyo RC 2400 12v Sub C NiCads sold on overlander. Not too surprising that they are having a hard time off a 3hp mag. I am looking at running the mag off the nicads and get around 6 spin ups and the drive off some nimh i have lying around.
I wish I had the cash to invest in lithium batteries but sadly its not available at the mo. I will just have to win a few events through the summer
Gary you must be doing something iffy then coz Vortex used the same batteries to great success and they were fine. And also i beleive Dizzy Tilly is running 3700mah NiMhs which dont give out as much current as the RC2400 Nicad Cells but is still using them fine and lasting fights and come out only a bit too warm but there fine.
Mr Stu
Alpha has blew both the Sanyo 2400nicads and GP3700 NiMhs, the 3000nicads (Botpacks) although can handle it but weigh too much so i can only run at 12v (not 14.4v) for comps. Im looking into these lithium cells but as i only run 14.4v (or maybe 13.2 or 16.5 for these) maybe its worth me taking a different route rather then using a modded Dewalt 36v pack.
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