[NTLK] Battery Level Indication with Rechargeables in AA Tray

[Tony Morrow]

Tony Khan’s "My Apple Newton" blog, as always, has details on that. Davis Remmel created a model that is available online and can be 3D printed.

http://myapplenewton.blogspot.com/2013/03/print-your-own-battery-tray-part-2.html

-Tony Morrow

On Nov 16, 2014, at 11:57 AM, Dennis Swaney <romad at mac.com> wrote:

> 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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