Nickel-Iron Battery/Research Development
Did some googling around and making notes, here is what I found :
-apprently their efficiency goes *up* with time over about 2 years 80% as mentioned in the forum, unknown exactly why would be nice to know -see the docs from the manufacturer's of the modern batteries seems like efficiency is reasonably high actually, was not able to determine if the charging efficiency is nearly equal to the round trip efficiency, so the graphs might paint an overly rosy picture, but I think it is pretty close http://www.changhongbatteries.com/Ni-Fe_battery_for_Solar_&_wind_appliances_p53_m2.2.1.html
low quality taken from browser history: http://www.beutilityfree.com/content/index.php?option=com_content&view=article&id=106:Ni-FeFAQ&catid=42:Nickel-Iron%20Batteries http://www.green-trust.org/wordpress/2010/07/14/american-made-nickel-iron-nife-forever-batteries/ http://www.ironcorepower.com.au/page3.php http://www.varta-automotive.com/index.php?id=87 http://www.ehow.com/way_5993981_homemade-edison-cell.html http://ps-survival.com/PS/Batteries/NiMH/Iron-Nickel_Battery_2008.pdf http://www.electro-tech-online.com/renewable-energy/100471-building-good-working-capacity-ni-fe-battery.html http://www.incompliancemag.com/index.php?option=com_content&view=article&id=56:the-lost-almost-technology-of-the-edison-cell&catid=29:just-for-fun&Itemid=138
higher quality http://www.nickel-iron-battery.com/
http://fieldlines.com/board/index.php?topic=144379.0 says "combiner caps" catalytic caps are available http://sustainabledesignupdate.com/2010/02/green-battery-design/ says they have/had a team developing them I emailed them http://apptechdesign.org/contact-us/ as asking for any documentation they can send on their work
http://www.solarpowerforum.net/forumVB/off-grid/4509-nickel-iron-batteries-8.html on one page here includes list of manufacturers that currently make them
the product pages etc form blog post http://www.uni-regensburg.de/Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/chembox_edison-e.htm more
Swedesh pat.Nos 8.558/1897, 10.177/1899, 11.132/1899, 11.487/1899 and German Patent No.110.210 /1899. US.Pat No.678.722/1901, 692.507/1902 and German patent No 157.290/1901 http://edison.rutgers.edu/patents/01488481.PDF didn't look at http://www.patents.com/us-4330603.html
may be other patents, companies that make them and search freepatentsonline using the advanced search function for assignee name may turn up more and more recent
This is good stuff, but it shouldn't be on the talk page, it should be in something like Nickel-Iron Batter/Research. - Mark Norton
Oh, I didn't know that page existed. It should be linked to from the nickel iron battery page. I think using "related pages" as done in wikipedia more often would be a good idea. I will do it now. Okay it has been moved and I will add the link in related page section.