INTL 3:770/1 3:770/3   
   REPLYADDR not@telling.you.invalid   
   REPLYTO 3:770/3.0 UUCP   
   MSGID: <65f36ffb@news.ausics.net> 578c8084   
   REPLY:  5e39f3e6   
   PID: SoupGate-Win32 v1.05   
   Andriy D  wrote:   
   > The Natural Philosopher  wrote:   
   >> 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.   
   > Majority of the schemes I've found so far suggest use of NiMH cells as   
   > they are less 'combustive'.   
      
   Indeed, but if the power requirements are low (a Pi Zero without any   
   power-hungry USB/HDMI connections) then supercaps might be an easier   
   option. Since then you don't need to worry about over-charging,   
   which will still wear out NiMH, even if it doesn't then burn your   
   house down.   
      
   Here's one project that came up in a quick search:   
   https://hackaday.com/2020/11/05/a-super-ups-for-the-pi/   
      
   > However cheap AliExpress devices do use Li-ion cells. Confusing :)   
      
   Confusing? Not at all, those Chinese sellers know you're not going   
   to be able to sue them if their junk burns your house down. If you   
   buy a mains powered device from them I think you're lucky if the   
   secondary doesn't short right through to the mains and kill you   
   when you touch it - it's happened before with phone chargers. It   
   was recently in the news here in Aus that Li-Ion batteries had   
   caused over 1,000 fires in the past year. I'm highly suspicious   
   even of cheap locally-distributed Li-Ion products and wouldn't   
   consider buying one from an unaccountable AliExpress seller unless   
   I was prepared to sit near it the whole time it charges on a   
   fire-proof surface.   
      
   --   
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   --- SoupGate-Win32 v1.05   
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