Re: 29c battery contacts Message #2 Posted by David Smith on 10 Sept 2005, 11:11 a.m., in response to message #1 by Hal
The batteries should be strapped together on the end (you should not trust just the spring to connect the cells). Also there needs to be some slack in the strap so that the cells can move freely (they can't be glued together). I also clean the contacts in the calculator by applying a drop of DeOxit contact cleaner, gently polishing them with a wire brush wheel in a Dremel, wipe off the residue, and then use another light drop of DeOxit.
For stuborn machines (and all HP-19C and HP-10's) you may need to place a small wad of aluminium foil on each battery contact.
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