From: tnp@invalid.invalid   
      
   On 14/03/2024 07:57, Andriy D wrote:   
   > This is exactly my concern - I want this think up&running 24/7/365 and I   
   don't want   
   > it to burn my house down 🙂   
   > I guess this is where you'd say 'risk' and 'price' are in a inverse   
   relationship 😉   
   >   
   >   
   > --   
   It is entirely possible to trickle charge a lithium cell at uber low   
   risk, Essentially you want to current limit the supply at at one tenth   
   of the hourly capacity so e,g a 2200mAh celll would need to be charged   
   at no more than 220mA, and voltage limit the charge at 4.2V.   
      
   That will give you a cell which, off charge in UPS mode will slowly   
   decay to an end point of around 3.5V.   
   You will need a step up converter to deliver a sane 5V to the pi and   
   some way to power it all down in case of battery going too low.   
      
   That's probably a case for a Pi Pico.   
   Or buy a unit that's already done it all :-)   
      
      
   --   
   Those who want slavery should have the grace to name it by its proper   
   name. They must face the full meaning of that which they are advocating   
   or condoning; the full, exact, specific meaning of collectivism, of its   
   logical implications, of the principles upon which it is based, and of   
   the ultimate consequences to which these principles will lead. They must   
   face it, then decide whether this is what they want or not.   
      
   Ayn Rand.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)