LiFePO4 batteries

On 10/11/2012 7:05 PM, Uncle Fuzzy wrote:
On Thursday, October 11, 2012 3:10:36 PM UTC-7, JohnDeRosa wrote:
On Wednesday, October 10, 2012 9:04:15 PM UTC-5, Uncle Fuzzy
wrote:



"His charging system is a piece of lamp cord cut to a length that
delivers his desired charge current."



Huh? The wire length limits the charge current? I may be dense
but you are going to have to explain this to me a bit more.
Wire has resistance, enough wire (his cord is approximately 30 feet
long)has enough resistance to drop the charge current to his target
10 amps. That's an extrememly mild charge rate for an A123 cell pack
that will happily discharge at 80 amps.

Was that cheaper than buying a charger? Even if the wire was free, I
think it'd be safer and cheaper in the long run to buy a charger that
was smarter than a piece of wire.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)