Werner Almesberger
2016-03-27 02:00:53 UTC
You have to design the case anyway. I would expect that the case is the
battery holder, so you only need to insert the contacts.
The tricky bit is finding suitable contacts. Well, since I hadn'tbattery holder, so you only need to insert the contacts.
picked contacts just yet, I went on a search ...
I found five different types:
1) PCB-mounted, SMT. Alas, they all have the battery above the
contact, not on the side. A side-facing contact would be very
nice to have, also solving the issue of how the battery
contacts connect to the PCB.
For AAAA, this exists:
http://www.battery-contacts.com/part.php?pn=BK-6113
Alas, they're too small to even try with AAA.
2) PCB-mounted, through-hole. Some are fairly bulky and some seem
to be just contacts used in battery holders with a plastic base,
e.g.,
Holder (1075):
http://www.keyelco.com/product.cfm/product_id/14043
Positive contact (1075-1):
http://www.keyelco.com/product.cfm/product_id/14196
Negative contact (1075-2):
http://www.keyelco.com/product.cfm/product_id/14211
These might actually fit. Alas, the 1075-2 is completely
undocumented.
3) Slide-in. They slide into a slot in the case. There are several
types of terminals. In our case, we'd need cables. Example:
http://www.keyelco.com/product.cfm/product_id/891
4) Snap-on. Similar to slide-in, but they snap over a wall in the
case. Example:
http://www.keyelco.com/product.cfm/product_id/874
I also found something quite remarkable, bare contacts for coin
cells:
http://www.digikey.com/product-detail/en/keystone-electronics/120TR/36-120CT-ND/5872901
http://www.digikey.com/product-detail/en/keystone-electronics/112TR/36-112TR-ND/4499393
I've been wondering for years why the industry didn't offer something
as simple as this as an off-the-shelf product. Now it finally does.
Next, details.
- Werner
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