From: John H. Kim (jokim_at_mit.edu)
Date: Tue Mar 07 1995 - 17:18:26 EST
In message Mon, 6 Mar 1995 23:11:26 -0500 (EST),
Joshua Hosseinoff <hosseino_at_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
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.
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