In <07c6dfdb-88a5-4441-8e85-c7a0ee43bfcfn@googlegroups.com> by Peter W.   
    on Fri, 17 Mar 2023 10:23:27 we perused:   
   *+-> I have an hp2621a terminal which had a battery to keep nonvolatile   
   settings   
   *+-> (eg baud rate, parity &c). I want a chargeable battery to keep those   
   settings   
   *+-> going but to charge when I have the machine on.   
      
   *+-The issue that comes to mind is whether a/the power-supply would cause   
   problems if connected to the terminal with or without the battery. If not,   
   would an appropriate Zener diode do the trick?   
      
   Thanks..   
      
   THough I also realise I could get two batteries, use one, charge the other..   
      
   But I suspect it will not fit exactly so I need to solder it   
      
   --   
   	 Vasos Panagiotopoulos  panix.com/~vjp2/vasos.htm   
     ---{Nothing herein constitutes advice.  Everything fully disclaimed.}---   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)