[NTLK] Battery Level Indication with Rechargeables in AA Tray

[Dennis Swaney]

Wasn't someone also working on a 3D printer design?

Sincerely,
Dennis B. Swaney

"I think, therefore I Mac"

On Sat, Nov 15, 2014 at 9:09 PM, Anthony Morrow <anthonydmorrow at gmail.com>
wrote:

> Sonny Hung built two rechargable battery tray prototypes several years.
> His information is documented on Flickr.
> https://www.flickr.com/photos/sonnyhung/sets/72057594074185913/
> https://www.flickr.com/photos/sonnyhung/sets/72057594079049821/
>
>
> On Nov 15, 2014, at 11:30 PM, Kevin LaCombe <my_newton at wavecable.com>
> wrote:
>
> > I can't find the link at the moment but I have a printed page (from
> Marco Mailand I think?) that details how he did the modification of a AA
> tray and the idea of a switch if you want to load alkalines as well.
> >
> > On Nov 15, 2014, at 7:01 PM, Woody Smith <woodysmith at me.com> wrote:
> >
> >> This is in fact a challenge. I scavenged thermister and polyswitch from
> an eMate battery pack. Thermister requires two contact pads and wires
> soldered to them, the difficult part is keeping the wires from interfering
> with the batteries. I ran them on the outside taking advantage of the
> alignment channels, trimming the tracks inside the silo was necessary to
> allow space. There is room at the end opposite the contacts for the
> Poliswitch. I cut the wire connected to the spring and managed to bridge
> the gap with the switch.
> >>
> >> The Poliswitch is only necessary if you need it. If you need it and it
> isn’t there, these batteries can get extremely hot.
> >>
> >> Woody
> >>
> >>
> >>> On Nov 15, 2014, at 7:27 PM, Andrei Chichak <newton at chichak.ca> wrote:
> >>>
> >>> You know, since the 2x00 used NiMH batteries in the bricks, it
> wouldn’t take much effort to rewire a AA sled to charge the cells.
> >>>
> >>> I would think that the biggest hurdle would be adding an extra contact
> for a temp sensor. The polyswitch is for protection and - we’re all butch
> here grunt grunt - it can be deleted.
> >>>
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