-------- In message <canx10hb-ocalkkje8yenqzpnhxmvx3pxzpsjqvkq0aejdqw...@mail.gmail.com>, "Dr. David Kirkby (Kirkby Microwave Ltd)" writes:
I belive in the instant case Lead-Acid was used as a noise-free power source rather than as backup. >If do, I believe that the choice of a lead acid battery is a poor one. I >believe that even the sealed ones release very small amounts of sulphuric >acid [...] Lead-acids, sealed or not, shall always be ventilated. The main problem is actually not sulphuric acid but rather hydrogen. Apart from the potential to explode if it accumulates, hydrogen is bad for pretty much all metals, which it penetrates easily. (The way one filters hydrogen is to pump it through a filter consisting of a 2mm thick massive slab of Rhodium, and it isn't particularly hard.) >That said I somewhere read they were banned in Europe [...] Anything involving Cadmium is banned under ROHS and for good reasons. You can still get approval to use them in specialized applications where there are no realistic choice, provided you make provisions for their safe recycling. Few such approvals have been given. A lot of the stuff which says "NiCd" these days is actually Nickel-metalhydride where the marketing department hasn't got the memo. >I don't know if there is any simple way of slowly charging Lithium Metal >Hydride batteries. There isn't. They're almost the worst possible kind of battery for float-service. Lead-acid is still the best way to go. -- 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.