KTA drop ships them from another supplier in the US. I've always had good luck with KTA so that is why I ordered from them. It sounded like they periodically get orders in and ship from that. I don't remember how long it took mine to show up but it was less than 3 weeks. They are a really nice size. Basically they are like small versions of the TS cells I put in my Gizmo. The lids on the packs I received actually covered the exposed terminals better than the ones in the picture on KTAs website. If you capacity test to the specs that the manufacturer gives they deliver 20Ah but if you limit your charge to a more reasonable high of 3.6V at 1A or 3.4V at nearly 0A for your cutoff and stop discharge at 2.5V with a 0.5C load you will realize close to 19Ah. I'm not at home right now so I can't check my data.
On Mon, Apr 28, 2014 at 8:13 PM, Michael Ross <michael.e.r...@gmail.com> wrote: > Thanks, David, that sounds like a good fit. Sounds like the 40AH I was > looking at are way overkill. > > They ship in 2 to 3 weeks - sounds like they are not stocking, just > brokering for a Chinese manufacturer. > > This is all speculation, because I may like the Pb cells in it just fine. > I wonder how much they would cost. I am not familiar with buying lead > batteries, except from the auto parts store. > > > > On Mon, Apr 28, 2014 at 10:00 PM, David Nelson <gizm...@gmail.com> wrote: > >> I picked up a B&D 24V push mower for free. It needed batteries and a >> charger. I removed the charging circuit & batteries and replaced the >> batteries with two sets of GBS 20Ah >> ( >> http://www.kta-ev.com/Battery_4_GBS_3_2V_20AH_cells_p/bat-gbs-lfmp20ahx4.htm >> ) >> which are an almost exact size replacement for the lead acid >> batteries. I installed a self powered digital volt meter in place of >> the old analog meter and carefully bottom balanced the pack. I know >> when to stop mowing when the voltage reads 20V when not cutting grass. >> They bounce back to just over 3V per cell. I don't have a charging >> plug yet so I still have to remove the cover and charge the batteries >> with my bench power supply. Charging to 3.4V per cell average means I >> don't have to worry about overcharging the cells. Yes, I checked. It >> seems like it just runs for ever. It could mulch mow the yard of a >> 1200 ft^2 ranch style house on a 6000 ft^2 lot (I'm not sure of the >> lawn area) and still have energy left. >> >> On Mon, Apr 28, 2014 at 9:58 AM, Michael Ross <michael.e.r...@gmail.com> >> wrote: >> > I have an old simple ICE push mower, that might be worth converting. >> > >> > Can anyone recommend the sort of motor I should look for? >> > >> > Re-purposing a motor would be nice. >> > >> > I would use LFP batteries. >> > >> > What about the shock of the blade hitting something nearly immobile? That >> > is a lot of shock that small engines are able to handle - special >> > consideration in the regard with electric motors? >> > >> > Mounting the blade seem non-trivial? Hints? >> > >> > Thanks! >> > >> > I just saw a Li ion powered mower on line for $500. supposed to run for >> 45 >> > minutes and charge back in 30. That sounds like a practical target. 48V >> > pack. Weighs 62lb. >> > >> > Any thought on this side of the equation? 36V? 60V? Capacity needed to >> > go 45 minutes? >> > >> > -- >> > Don't believe everything you read on the Internet - Abraham Lincoln >> > >> > A public-opinion poll is no substitute for thought. >> > *Warren Buffet* >> > >> > Michael E. Ross >> > (919) 550-2430 Land >> > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google >> Phone >> > (919) 631-1451 Cell >> > (919) 513-0418 Desk >> > >> > michael.e.r...@gmail.com >> > <michael.e.r...@gmail.com> >> > -------------- next part -------------- >> > An HTML attachment was scrubbed... >> > URL: < >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140428/7e307136/attachment.htm >> > >> > _______________________________________________ >> > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> > http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> > For EV drag racing discussion, please use NEDRA ( >> http://groups.yahoo.com/group/NEDRA) >> > >> >> >> >> -- >> David D. Nelson >> http://evalbum.com/1328 >> http://www.levforum.com >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA ( >> http://groups.yahoo.com/group/NEDRA) >> >> > > > -- > Put this question to yourself: should I use everyone else to attain > happiness, or should I help others gain happiness? > *Dalai Lama * > > Tell me what it is you plan to do > With your one wild and precious life? > Mary Oliver, "The summer day." > > To invent, you need a good imagination and a pile of junk. > Thomas A. > Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> > > A public-opinion poll is no substitute for thought. > *Warren Buffet* > > Michael E. Ross > (919) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > michael.e.r...@gmail.com > <michael.e.r...@gmail.com> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140428/3a32ea13/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > -- David D. Nelson http://evalbum.com/1328 http://www.levforum.com _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
