[NTLK] rechargeble battery pack for messagepad 2100

Dennis Swaney romad at nvwisp.com
Tue Aug 28 13:06:10 EDT 2018

What about using lithium AAs in the non-rechargeable tray?

Dennis B. Swaney

"I think, therefore I Mac"

On Tue, Aug 28, 2018 at 5:40 AM, Sonny Hung <sonnyhung at gmail.com> wrote:

> > On Aug 28, 2018, at 6:39 AM, Rufus Kohn <rufuskohn at gmail.com> wrote:
> >
> > A question of common sense to make the right choice. I will ask Frank to
> > re-cell one pack and get a some rechargeable cells for the aa tray.
> It’s a good choice to have Frank or another NTLKer who has recelled a
> rechargeable pack. This discussion regarding options has been throughly
> fleshed out in the past.
> Just to put my two pennies in.
> Original Options are:
> 1) Battery Tray
> 2) Rechargeable Pack
> Current Options are:
> 1) Battery Tray (w/alkaline or NiMH)
> 2) Rechargeable Pack  (w/NiMH Original Capacity or higher)
> Possible Alternatives:
> 1) 3D printed in the near future
> 2) Modified Battery Tray for use with NiMH Only.
> I know that Frank’s opinion in the past on this is with concern because if
> one uses a modified Battery Tray and decides to use alkaline AA’s in them
> it could pose a possible danger IF you plugged in the power adapter. I know
> that I made two of them previously. Two prototypes which I believe are
> still being used. One in my personal MP2100 and one I sold to another list
> member I believe. *WARNING: The danger is real so IF you do this you do so
> at your own peril. You are forewarned and I’m can’t be held responsible if
> anything happens.
> The only item I didn’t address back then was the use of a switch to allow
> the use of alkaline AA’s safely which would prevent the Newton from
> recognizing the modified Battery Tray as a NiMH. But still if one forgot
> negative the switch to reflect the correct type of AA cells that would be a
> problem when using alkaline AA’s.
> As a DIYer with just basic tools I just needed to find an appropriate
> micro switch small enough to mount somewhere to address this issue and be
> able to tell the Newton if the batteries being used were alkaline or NiMH
> back then.
> IF you are planning to use NiMH AA’s ONLY I think this would be a good
> option for those users. The only caveat is making one besides the danger if
> you used alkaline AA’s and plug in a power adapter which the Newton would
> then attempt to charge the Alkaline AA’s.
> I’ll provide the link here:
> Prototype Rev1
> https://flic.kr/p/aCE8g
> Prototype Rev2
> https://flic.kr/p/aL5yW
> In Prototype Rev2 photoset I placed a last photo with instructions to
> remind me how to build them. If this is something you might want to do all
> you need for parts is a battery tray and a rechargeable pack and merge the
> two together. I’ve so little time now a days that I don’t do this stuff
> anymore other than for personal use. Plus I’d need to get better tools also
> lol.
> Regards,
> Sonny
> Sent from my iPad
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