RE: HP programmable calculator batteries

[Harry Binswanger hb@xxxxxxxx]

Marc wrote:

> I never gave any thought to amperage requirements - that would be determined
> by the demand put on the battery pack by the laptop.


Hmm. Shades of Ohm's law, I guess. Voltage is fixed, resistance is fixed,
so amperage follows. Okay.


> As I mentioned, the cells were AA size, and about 25-30% smaller than the
> original ones, so the duration of the battery is significantly reduced. But
> it did prolong the life of the laptop (and made it handy for uploading
> digital photos to it on the move)


Forgive my confusion but you can recharge regular, cheap AA batteries? Or
did you buy an AA-size rechargeable?


Harry





> mARC
>
>
> -----Original Message-----
> From: owner-xywrite@xxxxxxxx
> [mailto:owner-xywrite@xxxxxxxx] On Behalf Of Harry Binswanger
> Sent: Thursday, 2 March 2006 8:53 p.m.
> To: xywrite@xxxxxxxx
> Subject: RE: HP programmable calculator batteries
>
> Marc,
>
> Just want to get clear on the principle here. Are you saying that when one
> can't get the standard battery, one can still substitute any other combo of
> batteries that puts out the same voltage, just making an ad-hoc physical
> connection to the standard input circuitry? That makes perfect sense, but I
> am kinda surprised that there isn't an issue of matching amperages.
>
> I ask because I'd like to try making up substitutes, as you apparently
> have, for things that use unique, non-standard batteries.
>
>
> >Hi
> >
> >I've done the same thing to an old Toshiba laptop battery.
> >A new one was worth twice what the laptop was worth.
> >Cut it open, popped out the old batteries.
> >New batteries were a bit smaller. Hot-glued in 8 batteries soldered
> together
> >along with the bi-metallic 'cut-out'.
> >Fitted a 12v plug to the front of the battery to allow charging from a car
> >cigarette lighter and presto.
> >Only got about 1 hour from the batteries, but being able to drive the
> >charger around the countryside was a bonus.
> >
> >Re-chargeable batteries are generally only 1.25v per cell - not 1.5v.
> >
> >Marc
> >
> >
> >
> >-----Original Message-----
> >From: owner-xywrite@xxxxxxxx
> >[mailto:owner-xywrite@xxxxxxxx] On Behalf Of flash
> >Sent: Thursday, 2 March 2006 4:32 a.m.
> >To: xywrite@xxxxxxxx
> >Subject: HP programmable calculator batteries
> >
> >Phil White wrote that his HP-65 card programmable calculator's batteries
> >are kaput. I'm not sure what model that was, but if it's like my HP-25
> >programmable calc., you can keep it running on replacement non-HP
> >batteries. Just cut open the HP battery-holder with a razor, pop out the
> >original cells, and put in any good quality rechargable 1.5v AA
> >cells. Then superglue the battery-holder back together. I did.
> >
> >
>
>
> Harry Binswanger
> hb@xxxxxxxx



Harry Binswanger
hb@xxxxxxxx