Hello John, You may be interested that I have purchased a number of 20Ah A123 cells. I have two batteries each 10 cells and a further 10 loose cells.
I have not yet tested the full capacity. The batteries are capable of over 100A discharge for several minutes without getting warm. Any tests you would like to see. Peter Champness On Fri, Jun 14, 2013 at 7:21 AM, John Parncutt <[email protected]>wrote: > Hi All,**** > > ** ** > > ** ** > > Further to February’s Aus soaring discussion on Lithium batteries, this > month’s issue (June 2013) of Silicon Chip magazine has a an interesting > and informative article on the latest developments in this technology.**** > > ** ** > > ** ** > > ** ** > > John Parncutt**** > > ** ** > > ** ** > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *John Parncutt > *Sent:* Tuesday, 26 February 2013 5:58 PM > *To:* 'Discussion of issues relating to Soaring in Australia.' > *Subject:* Re: [Aus-soaring] LiFePo4**** > > ** ** > > Hi David,**** > > ** ** > > The link you provide is to exactly the same model of Shorai battery I have > been evaluating. The load tests I have done give it an actual capacity of > 4 A/H (far from the stated capacity of 14 A/H).**** > > ** ** > > I have attached an image of the results for your info, for comparison the > results on one of our clubs existing (used) lead acid glider batteries is > also included.**** > > This clearly demonstrates the ability of the Lithium battery to provide an > almost constant voltage across its complete discharge period whereas the > lead acid battery voltage continually drops to a point where some of our > instrumentation and particularly the radio in transmit mode may fail about > halfway through discharge.**** > > ** ** > > If you note the Shorai literature states an *equivalent* A/H rating to > that of a 14 A/H lead acid battery not an actual A/H rating. This is > misleading and I think a bit of sales spin! The comparison I think is based > on the Cold Cranking capacity of the battery, ie. the ability to delivery > large currents to a starter motor bearing in mind these batteries are > designed to replace wet lead acid motorcycle batteries.**** > > ** ** > > The bottom line is that the 14 A/H Shorai battery will not deliver 1 amp > continuously for 14 hours, well certainly not the one I tested!!**** > > ** ** > > ** ** > > John Parncutt**** > > **** > > ** ** > > *From:* [email protected] [ > mailto:[email protected]<[email protected]>] > *On Behalf Of *David Conway > *Sent:* Tuesday, 26 February 2013 4:38 PM > *To:* 'Discussion of issues relating to Soaring in Australia.' > *Subject:* Re: [Aus-soaring] LiFePo4**** > > ** ** > > Agreed; something like this would be better > http://www.shoraipower.com/s.nl/it.A/id.91/.f**** > > ** ** > > 14AH – twice that of a normal SLA glider battery – and less than half the > weight @ 662g**** > > ** ** > > David**** > > ** ** > > *From:* [email protected] [ > mailto:[email protected]<[email protected]>] > *On Behalf Of *Future Aviation > *Sent:* 26 February 2013 15:02 > *To:* 'Discussion of issues relating to Soaring in Australia.' > *Subject:* Re: [Aus-soaring] LiFePo4**** > > ** ** > > Hi Ian**** > > **** > > From a safety point of view this is much better than what the Boeing > dreamliner **** > > is using.**** > > **** > > However, I would never put a battery like that in a glider unless it is > securely placed **** > > in a much more impact resistant enclosure.**** > > **** > > Kind regards**** > > **** > > Bernard **** > > ** ** > ------------------------------ > > *From:* [email protected] [ > mailto:[email protected]<[email protected]>] > *On Behalf Of *Ian Mc Phee > *Sent:* Tuesday, 26 February 2013 2:15 PM > *To:* Discussion of issues relating to Soaring in Australia. > *Subject:* [Aus-soaring] LiFePo4**** > > About $87 and notice a new Arcus M was fitted at factory with something > similar. This is NOT what B787 is using. **** > > Ian M**** > > > http://www.hobbyking.com/hobbyking/store/__22656__ZIPPY_Flightmax_8400mAh_4S2P_30C_LiFePo4_Pack_AUS_Warehouse_.html > **** > > ** ** > > ** ** > > ** ** > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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