dev@ei.ecn.purdue.edu (Larry Weeks) (10/13/90)
Hello all,
I've noticed something rather strange with my HP28S's treatment of
batteries. After taking a set of old batteries out, I tested them
with my meter. Of the three batteries, only one was totally drained.
The other two were identical in all respects to a new battery. Full
amperage, identical resistance, etc... So, I took the three new
batteries out, put the two original ones back, and one new battery.
Voila! Fully functional. I've been running it like that for about a
month, and it hasn't drained either of the two older batteries yet.
My girlfriend's HP28S is the same way, so it can't simply be a fluke.
Has anyone else noticed this? And if this has already been covered
here in the past, sorry... I just subscribed.
Larry
dev@ecn.purdue.edufseipel@hpuxa.ircc.ohio-state.edu (Frank E. Seipel) (10/13/90)
I have noticed that the batteries that come with the 28C last *much* longer than those I have purchased since the original batteries were drained. I am wondering what type of batteries come with the 28C; if we could order them somewhere it would probably eliminate these problems. The 48SX is an incredible calculator. It is nice to be able to look up atomic and molecular weights, constants, and the equations of motion with the Solver cartridge.
paul+@andrew.cmu.edu (Paul J. Dujmich) (10/15/90)
Batteries are nothing but oxidation/reduction reactions looking for a place to happen. When you put the batteries in, one was proably older (or leakier) than the others, and it's redox reaction ended before the others. By the way, how did you measure the resistance of those batteries? You must have one heck of an ohmmeter. Paul