From: shaun.at.pukekohe@gmail.com   
      
   On 30/09/2019 7:38 AM, etpm@whidbey.com wrote:   
   > On Mon, 30 Sep 2019 00:19:07 +1300, ~misfit~   
   >  wrote:   
   >   
   >> ... that I can use to drain alkaline cells and push the 'charge' into   
   either a lithium-Ion cell   
   >> (for a flashlight), a phone or a powerbank.   
   >>   
   >> I have a combined wireless doorbell - inside/outside thermometer that I   
   quite like. Unfortunately   
   >> it won't run on NiMH cells and only uses alkalines down to 1.33v. (It's the   
   only thing I have that   
   >> doesn't run on rechargeable cells.)   
   >>   
   >> The sender uses AAA cells and the receiver uses AA cells and I buy good   
   quality (expensive) cells   
   >> to get the longest run-time between changes (as it's a PITA to re-pair them   
   and re-set the clock in   
   >> the receiver too often). I though of converting the receiver to run on a   
   single 14500 Li-Ion cell   
   >> (AA size) and a buck regulator or even a wall-wart but that still doesn't   
   solve the issue of the   
   >> sender.   
   >>   
   >> I dislike throwing good quality alkalines away when they still have ~65% of   
   their capacity   
   >> remaining but have had enough leak-disasters to not want to put already   
   semi-discharged cells in   
   >> remote controllers etc. where they then get forgotten about until things   
   stop working. (I've never   
   >> had an Eneloop leak and they run my remotes for about 3 years between   
   charges.)   
   >>   
   >> So I'd like to make a gizmo that takes a single alkaline and pushes out ~5v   
   through a USB cable for   
   >> as long as the cell has juice, preferably at a reasonable current. I have a   
   few different pre-made   
   >> boost modules from the usual suspects but when I tested one the output   
   voltage curve dropped with   
   >> the input so that it wasn't very successful.   
   >>   
   >> If anyone has any ideas for something I can put together with a bit of   
   veroboard or similar I'm all   
   >> ears. I'm tired of having loads of half-used cells sitting around but don't   
   want to just chuck them   
   >> away. I've thought of this before but it's fresh in my mind as I've just   
   bought a 32-pack of each   
   >> size cell and they cost quite a chuck of change.   
   >>   
   >> TIA.   
   > If there is room for two AA cells in the sender why not substitute a   
   > lithium pouch cell and a regulator? Then you could charge the pouch   
   > cell while in the sender and never worry again about pairing the   
   > devices?   
   > Eric   
      
   The sender uses two AAA cells and is very tightly packaged. Also it's   
   waterproof as it's outside in   
   the elements so I don't want to mess with it too much.   
      
   Cheers,   
   --   
   Shaun.   
      
   "Humans will have advanced a long, long way when religious belief has a cozy   
   little classification   
   in the DSM"   
   David Melville   
      
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