In message <4c703124.20...@xtra.co.nz>, Bruce Griffiths writes: >Poul-Henning Kamp wrote:
>NIST found that NiCd cells are very quiet at least for low load currents: > >http://tf.nist.gov/general/pdf/1133.pdf Too bad they didn't include lead-acid in that test... >Perhaps its the gelled electrolyte that is the source of the noise >problem with VLRA batteries?? The batteries I used were pre-owned AGM, and apart from possibly the frequency spectrum, I wouldn't expect AGM/Gel to make any significant difference. The very few hints I have been able to find, talk about bubbles and mechanical shifts in the particulate matter in the electrodes but they were all trying to divine battery health from these entrails, rather than measuring the absolute magnitude of the problem. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.