So, I have a broken Tempest that I want to play with.
When tearing it down, and checking parts…I see that the internal battery is 2.4v.
Question is, if I want to supply mains power at ~ 3v, where would I solder the wires on the circuit board? I plan on removing the dead battery and just not having one.
--Sam
Wouldn’t you just connect them where the battery was connected?
That was my first thought… Looking for a sanity check…
Lol
So, my second question would be… anyone document the pin out for the bottom pogo pads?
Hi
You could -probably- just connect to where the battery terminals are, as the solar charging circuit would probably not care. I’d be inclined to keep it under 2.7 volts though. Add diodes in series from your power supply to arrive in the 2.5v range. (USB 5v power plus 5 silicon diodes etc).
Why not just replace the battery? I just replaced mine with a opposite pole LTO 2.4v battery from Aliexpress $10 USD shipped (eventually). You’d have to extend the negative side with a 20ga wire down to board and add a lead to positive it’s a bit of a pain but it works. Same size/spec battery as original afaict. (Except for bipolar vs two leads )
https://www.aliexpress.us/item/3256809596738836.html?
I found the official battery but you have to buy like 30 of them so unless you want to go into the battery business…
Biggest pain with replacement is dealing with the silicone goo. Squeegee off into temp container the reapply when done. Battery clip on board can be pry’d off with tiny flat screwdriver, and then old battery sides right out. Clip Base remains. Will accept solder. Probably a better long-term solution with the solder anyway.
Fwiw