[NTLK] Battery

[Woody Smith]

Frank this is the one that Stephanie used in her hack

https://www.digikey.com/product-detail/en/keystone-electronics/192/36-192-ND/61798

I’ve used it in a couple of eMates, successfully as I recall. Requires removing some plastic from battery area. And care to not short circuit any connections 

Woody 

Sent from my iPhone

> On Dec 3, 2019, at 6:58 PM, Vladislav Korotnev <vladkorotnev at gmail.com> wrote:
> 
> Thanks for your warning Frank,
> 
> One thought that springs to my mind about the current capabilities is,
> was it a holder with "spring"-type contacts or with "flat bent metal
> strip"-type contacts?
> 
> For some reason I have a feeling the latter should withstand more
> current due to better surface area.
> 
> That is, even if 1.2A-capable battery holders exist at all -- 'cause
> 1.2 amps is quite a ton for a usual AA battery pack in general.
> 
> Worst case scenario, just don't charge them inside the eMate and use a
> simple charger externally instead, I guess.
> 
> Best regards,
> 
> On 12/4/19, NewtonTalk <newtontalk at pda-soft.de> wrote:
>>> Ok so I bought 4aa Nimh rechargables and a plastic holder for them. I
>> wired them up to my emate 300
>>> and the batteries will not charge (says too much power so they wont
>> charge) and then says fault.
>>> What am i doing wrong here ?
>> 
>> Most likely you have forgotten to transplant the temperature resistor from
>> the old pack. See
>> 
>> <http://www.pda-soft.de/emate_battery_pack.html>
>> 
>> This will also explain why you can, but shouldn't, omit to also transplant
>> the overcurrent protection switch.
>> 
>> That being said: I'd strongly advise everyone to refrain from using an
>> off-the-shelf battery holder in his eMate. On and off, I've tinkered with
>> this for the last 15 years or so, and as yet I haven't found a seller who
>> was willing, let alone capable, to provide me with a data sheet that sheds
>> any light on the battery holder's contacts maximum current specification.
>> Contacts in a holder suitable for an eMate must be specified for a
>> continuous load of 1.2 Amps or more. This is bacause the eMate will be
>> charged with 1.2 Amps when using the original AC adapter.
>> 
>> Some years ago, when I tried this for the first time with a normal holder
>> like the ones you buy at Radio Shack, it took the eMate about five minutes
>> to melt the plastic surrounding the holder's metal contacts. This was
>> because the contacts couldn't withstand the charge current and became hot
>> like hell. Thank God most cheap battery holders' plastic develops a
>> disgusting smell when melting. So disgusting I was able to smell it one
>> floor below. Otherwise my house might have gone up in smoke.
>> 
>> I'm not kidding. Either insist on a datasheet and make sure the holder can
>> handle a continuous load of 1.2 Amps charge current, or forget it. Unless,
>> of course, you are homicidal or suicidally inclined...
>> 
>> Cheers
>> 
>> Frank
>> 
>> -- Newton software and hardware at http://www.pda-soft.de
>> 
>> 
>> 
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>> 
> 
> 
> -- 
> // Ak.R.
> 
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