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HP 28S is very loud when opening/closing
01-31-2020, 07:51 PM (This post was last modified: 02-01-2020 11:17 PM by edryer.)
Post: #12
RE: HP 28S is very loud when opening/closing
yes, thank you Burkhard, I did indeed mean your suggested 2/3 AAA, flat-top, apparently there are two types of flat top and one of them isn't truly flat top, your link was to the smaller (and suitable battery) - if any folk order these (other from burkhards link) and they are described as flat top I suggest looking to make sure they are truly the flat top variety (also known as Industrial in some places).

I have also seen 1/3 AAA batteries advertised, coupled with some dowel and aluminium foil this may also be a solution. One guy used 3 watch cells and dowel + aluminium (+ custom cover ( ) but 3 x 1/3 AAA may last quite a bit longer.

So another idea may be 3 x 1/3 AAA with dowel/aluminium foil which may truly relieve all pressure on the battery hatch!

The 28S is a fantastic device, and I note now that prices have risen the last few years, becoming far more collectable.

HP-28S (1988 US model), DM41X (2020)
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RE: HP 28S is very loud when opening/closing - edryer - 01-31-2020 07:51 PM
How about a dry lube? - striegel - 02-02-2020, 08:41 PM

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