HP75 Battery



#3

After doing nothing about it for years, I finally replaced the battery in my HP75C.

I ended up getting one of those cordless phone NiCds which was shrink wrapped in white plastic and contains 3 AA batteries.

I cut the plug off the wires and soldered them to the gold contacts. I noted the battery website which explained the polarities. I also connected the extra tab to the black wire which I think charges the battery. (I still have the charger).

The main problem apart from being rusty in soldering, was that I couldn't get the battery cover back on.

Eventally I slit the shrink wrap because the original battery had deep grooves for the gold contacts (and some blobs of solder) which were not now recessed on the new battery because of the shrink wrap.

I also had to shave some of the ribs inside the cover as they were stopping the cover from sliding on.

Now it's all working except the battery came fully charged and I now have to wait for it to discharge before I charge it. I will also remove the cover when charging so I can check the battery temperature in case I wired it up wrong.

I don't think so because the charging tab lined up with the negative groove on the battery.

Daryl,
Melbourne,
Australia


#4

If you wired the battery incorrectly, then your 75C would not work.

Not to mention that it is a bit too late to wonder about whether you have wired the battery correctly after you have installed it in you classic computer.

**vp


Possibly Related Threads...
Thread Author Replies Views Last Post
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 129 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  HP75 Plug-Module Simulator Manual pdf Jake Schwartz 2 154 04-23-2011, 07:59 PM
Last Post: Paul Berger (Canada)
  HP75 Accessories as new - any value or should I just use them? Tony de Groot 0 91 07-03-2009, 09:28 AM
Last Post: Tony de Groot
  HP75 HPIL IO Tony de Groot 6 276 04-25-2009, 05:02 AM
Last Post: Tony de Groot
  TDS 500K dead battery, pictures of the inside of the card and the battery. Geoff Quickfall 4 273 04-02-2009, 11:23 PM
Last Post: Geoff Quickfall
  MCLEX for HP75 Help !!!!!!! gileno 0 87 02-26-2007, 04:38 PM
Last Post: gileno
  Recharging batteries in a HP75 Pod GE 3 193 08-16-2006, 09:56 PM
Last Post: Vieira, L. C. (Brazil)
  How to halt green corrosion on HP45 copper battery contacts in battery bay? JaSon 1 139 07-01-2006, 07:27 AM
Last Post: David Smith
  HP75 Internal Design Specifications ? Edouard Lafargue 9 342 12-22-2005, 08:23 PM
Last Post: Howard Owen
  HP75's schematics Claudio 9 316 04-02-2004, 12:34 PM
Last Post: David Smith

Forum Jump: