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> Date: Tue, 7 Mar 1995 17:18:26 -0500 (EST) > From: "John H. Kim" <jokim@mit.edu> > Reply-to: jokim@mit.edu > To: TP750@CS.UTK.EDU > Subject: Re: Are Lithium Ion batteries avail... > In message Mon, 6 Mar 1995 23:11:26 -0500 (EST), > Joshua Hosseinoff <hosseino@yu1.yu.edu> writes: > > > What about the lead acid batteries that IBM first used in the original > > Thinkpad 500 models? I remember that in PC Magazine's battery rundown > > test which gets about 1 hour 45 mins on the 755CE, the lead acid battery > > in the 500 lasted for 9 full hours and thats in a test to rundown the > > battery as quickly as possible. Unfortunately as we all know IBM > > I think that's more a function of lower power draw by the 500. The TP750 > mono got 5 hours 30 min in the same test (I was averaging 5h 10m before I > bought a memory upgrade). Same battery as the 755CE. At work I run into a Not true, the 750 and 755CE have different batteries! > lot of battery energy density charts for autonomous subs and per unit > weight lead-acid is near the bottom. Progressively better are NiCd, > Alkaline, NiMH, and Li in that order. -- Adam Lee Wilkinson Portable Computing Technology Specialist Ford Motor Co. - Marketing & Sales Systems awilkin1@ren0010.so.ford.com