On 10 April 2014 12:58, Dwayne Reid wrote: > At 05:56 PM 4/9/2014, David VanHorn wrote: > >I want to see the charging connector... Figure 1AH charged in how many > >seconds..? > >The wall wart is also going to be impressive. > > Nah. The wall-wart contains its own battery used as an accumulator. > Maybe. > Power density (as opposed to energy density) is said to be about the same as for current "super-caps". If you can deal with them you can deal with the battery. Or not :-). 1AH in 30 seconds is (of course) 120 A mean at 100% efficiency. That's a very (very) substantial amount to deal with in a small volume and even small resistive losses produce large amounts of power loss and thermal problems. If battery voltage is 2V say then power 'rate' is 240W. 1% losses thermally is 2.4W - probably manageable. 5% losses is 12W and in a battery of "acceptable" volume energy density that's going to be difficult to deal with thermally, even over 30s. To achieve <=3D 5%/12W losses at 120A requires effective resistance of somewhat under 1 milliohm. That's (arguably) achievable in lead size alone but liable top be "exceedingly challenging" [tm] in practice. Dropping back to around 5 minutes to 80% charge very greatly reduces the difficulties and losses, is liable to be 'fast enough' in most cases and is reflected in practice by eg Toshiba SCIB seems t be the most visible of these in high energy use. Seiko reportedly use their own version in some of their watches to achieve reportedly superior energy density and lifetimes compared to previously used supercapacitors in this role. SCIB https://www.toshiba.com/tic/industrial/rechargable-battery Russell > dwayne > > > > > On 10 April 2014 05:52, YES NOPE9 wrote: > > > > > > > > > http://www.gizmag.com/nanodot-smartphone-battery-30-second-recharge/31467= /?utm_source=3DGizmag+Subscribers&utm_campaign=3Dc0503fcdb9-UA-2235360-4&ut= m_medium=3Demail&utm_term=3D0_65b67362bd-c0503fcdb9-90153089 > > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .