Re: hp50g change low battery threshold voltage
- From: sc_usenet@xxxxxxxxxxx
- Date: Tue, 30 Sep 2008 16:08:37 -0700 (PDT)
On Sep 26, 4:45 am, davoremard <davorem...@xxxxxxxxx> wrote:
While running hp50g on 500mAh NiMH batteries I get low
battery warning too early. Few hours after charging it shows
lowbat(S) while the batteries can hold 4.8-4.9V steady even at
CPU load and could run more than a week
of my usual usage.
Battery monitors will not run well with Ni-MH cells. The reason is
that unlike alkalines, Ni-MH batteries do not lose voltage at a
constant rate. They tend to hold their 1.2V until just before they run
out of gas. That's when the voltage suddenly drops without warning.
New alkalines will deliver 1.6V fresh and under no load, but once the
machine is on, alkalines will never output 1.5V.
I use 900mAh Ni-MH batteries and my low-bat warning comes very late.
Usually by the time the status indicator turns on, the calculator
already cannot stay on for long periods of time (i.e. several
minutes). However, turning it off and letting it "rest" for a short
time before restarting it will usually clear the annunciator, though
it always comes back momentarily, especially under the load of a CPU-
intensive calculation such as numerical integration.
S.C.
.
- Follow-Ups:
- Re: hp50g change low battery threshold voltage
- From: davoremard
- Re: hp50g change low battery threshold voltage
- Prev by Date: Re: Repeat operation on HP50g
- Next by Date: Kermit server
- Previous by thread: Repeat operation on HP50g
- Next by thread: Re: hp50g change low battery threshold voltage
- Index(es):
Relevant Pages
|
