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DTR-1 External battery pack experiments
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Subject: DTR-1 External battery pack experiments
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From: mlzwille@nyx10.cs.du.edu (Melvin Zwillenberg)
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Date: 6 Nov 1994 19:51:15 -0700
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Article: 7017 of comp.sys.pen
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Distribution: na
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Newsgroups: comp.sys.pen, comp.sys.laptops
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Organization: University of Denver, Dept. of Math & Comp. Sci.
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Xref: cc.gatech.edu comp.sys.pen:7017 comp.sys.laptops:25750
For those who may have seen some mention of experiments I was doing
to use an external battery pack with the Dauphin DTR-1, I must report
that the experiments have turned out unsuccessful.
A 12V pack consisting of 8-AA Renewal rechargeable alkaline
cells had a life of about 40 minutes. Thsi would indicate
that the internal voltage reduction circuitry in the DTR-1 actually
draws 2.1 amps as indicated on the a.c. adapter.
The alkaline AA's have a capacity of 1500 mAH and
(1500/2100)*60 is about 40 minutes.
Thus, to have a 3 hour life, an external
battery pack would need a capacity of 6.3 amp-hours (6300 mAH).
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