Lithium Polymer
- Thread starter Andrewg
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Steve
I agree there is no way these can do high discharge but in a micro the lack of weight plus big runtime may be very good
I got them for a long long runtime project ie low current draw
and they are big bikkys
I am told that by mid-year the hgh discharge version 10 C continuous will be available
Andrew
fastelectrics.com
I agree there is no way these can do high discharge but in a micro the lack of weight plus big runtime may be very good
I got them for a long long runtime project ie low current draw
and they are big bikkys
I am told that by mid-year the hgh discharge version 10 C continuous will be available
Andrew
fastelectrics.com
C
cme
Guest
I finally see someone trying lithiums, not that I get around much....
Anyway, I have about 2 dozen used laptop batteries that are full of Li Ion batteries and wanted to try them in my boat.
They are slightly larger than the Sub-C's and have about a 2.5V capacity(unconfirmed).
What I wanted to know was how you are charging your Li cells?
Unfortunately I don't have a donor laptop to rip the charger out of.
CLS...
Anyway, I have about 2 dozen used laptop batteries that are full of Li Ion batteries and wanted to try them in my boat.
They are slightly larger than the Sub-C's and have about a 2.5V capacity(unconfirmed).
What I wanted to know was how you are charging your Li cells?
Unfortunately I don't have a donor laptop to rip the charger out of.
CLS...
CME those lithiums are unlikely to be suitaboe for anything but a very low discharge rate
Check before you use them
Use a schulze or orbit charger for Lithium ions
BTW at this stage Kokams are not the go in boats too little current really - and they have very fragile tabs compared to the cylindrical cells we know. Discharge rates and hopefully the robustness of the cells will improve soon
Andrew
www.fastelectrics.com
Check before you use them
Use a schulze or orbit charger for Lithium ions
BTW at this stage Kokams are not the go in boats too little current really - and they have very fragile tabs compared to the cylindrical cells we know. Discharge rates and hopefully the robustness of the cells will improve soon
Andrew
www.fastelectrics.com
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- Feb 23, 2003
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The laptop batteries that I have seen are 2 parallel sets of 4 cells in series. The cells are 3.6V 1200mAh. This gives you an output of 14.4V at 2400mAh. The cells charge at 4.2V per cell and .7 of capacity. They are not polymers. If you short them they will EXPLODE. You can build your own charger from parts at radio shack for $20. Go to http://shdesigns.org/ and click on personal info/RC aircraft at the top of the page. There is a schematic for building Li ion charger. You can also buy them at http://www.b-p-p.com/products.htm Right now you can get a 1200mAh cell that is rated for 7.5 amps and 9+ in short bursts. You can pull more out of the cells but this only drastically kills the life of the pack. They should be coming out with some new cells mid year that are 10 amp rated. The one thing I like is that they are so light. A 7.2V 1020mAh battery pack weighs only 1.5 oz. When your plane only weighs 6 oz total, every .25 oz counts.
Mike
Mike
So, all this is beginning to look possible for an S400 type at least. A pack of 2 series/2parallel weighing 100g approx with a capacity of 2,400 mAh at a discharge rate of 15A continuous, as against my current 600 mAh ni-cads weighing 175 g approx. For the amount of time I get to play, overnight charging for a 20+ minute run time would be fine, especially as I have heard that they hold their charge well.
The only thing worrying me is the amount of acrimony being generated on the ezone by the aeropane types about the accuracy of the figures. They're also out of stock more often than not, so this is pretty hypothetical till they're available in Europe.
The only thing worrying me is the amount of acrimony being generated on the ezone by the aeropane types about the accuracy of the figures. They're also out of stock more often than not, so this is pretty hypothetical till they're available in Europe.
