Comments on: Economic Battery

By: just another person commenting on how much you FAILED

just another person commenting on how much you FAILED — Mon, 16 May 2011 21:56:22 +0000

you failed so much

By: Sticky-situation

Sticky-situation — Sat, 04 Dec 2010 03:37:13 +0000

Why destroy your pen? just spring for another battery!

By: Blarfengar

Blarfengar — Wed, 22 Sep 2010 15:30:39 +0000

Tl;DR

By: abacus

abacus — Tue, 13 Apr 2010 10:33:50 +0000

the spring gets hot, its force is reduced

By: Stoneshop

Stoneshop — Thu, 31 Dec 2009 21:51:56 +0000

HP stopped engineering when they spun off Agilent. THAT’s the real HP, actually; I don’t know why the current bearer of that name is admonishing itself “HP, invent”, because all they can do is sell gear that consumes ink, stuff that drives the gear that consumes ink, and most importantly, ink, Mindbogglingly expensive ink.

By: Stoneshop

Stoneshop — Thu, 31 Dec 2009 21:45:35 +0000

@foyherald: “but what calculator doesn’t show a constant LCD display (or LED for those that remember?) even if it is just 0?”

Well, calculators that have a Real Power Switch, like my HP29C. I doubt you’ll find any calculator with LED or VFD displays with only a soft-off; that came about with LCD displays and the associated ultra-low-power CMOS logic. And while it’s true that soft-off calculators are always on (they usually DO switch off their displays, though), it’s only a tiny part of their circuit that’s waiting (NOT scanning) for an interrupt from pressing the “ON” key.

By: Brennerr

Brennerr — Mon, 28 Dec 2009 09:03:19 +0000

Bahahahahahaha that was during an exam… while changing batteries, I somehow lost one of them… thankfully I had a spring – and no, it does NOT get hot… it worked like that for weeks, until I remembered to get a new battery =D

PS: its a HP39GS for those of you who give a crap…

By: foyherald

foyherald — Mon, 14 Dec 2009 18:05:30 +0000

Yes it was a generalisation, but what calculator doesn’t show a constant LCD display (or LED for those that remember?) even if it is just 0? and as in the case of computers even if you aren’t doing anything the processor is scanning for input even in sleep/hibernate mode thus using power!

By: Kuba

Kuba — Sat, 12 Dec 2009 19:44:41 +0000

If you do that and the calculator “breaks”, you have every right of going to the engineer at the HP that was responsible for the design and demand a personal refund. Although HP is, these days, nothing more than a glorified PC/networking equipment manufacturer, I doubt that their engineering is *that* bad. I bet the worst that would happen is the calculator would not turn on until you’d replace the wire/spring/nail with a battery. There’s no black magic to it, unless you just don’t understand much of it. In such case, as some friendly EE to explain it to ya.

By: Kuba

Kuba — Sat, 12 Dec 2009 19:42:06 +0000

You did something else. If you did what was shown in the picture, nothing would get hot. If unsure, measure (or experiment, as it may be).