Let me clarify my slightly unclear language. 1 battery = 12V 2 batteries = 24V 4 or more batteries may either be 24V or 48V. As others have said, packs of multiple batteries are taped or otherwise held together. Where the arrays are a single series string the jumper between the batteries are simple wire(s) with appropriate crimp connectors. Where batteries are paralleled, there is at least one fuse somewhere in the array which will blow if one of the batteries short out. In a consumer ups, this is often a blade automotive fuse either soldered or connected with a crimp connector and then the connection covered with heat shrink. On Mon, Jun 26, 2023, 1:08 PM Alexandre Souza <alexandre.tabajara@gmail.com> wrote: > No, I have apc ups with just one 12v battery... > > Enviado do meu Tele-Movel > > Em seg., 26 de jun. de 2023 16:06, Forrest Christian (List Account) via > time-nuts <time-nuts@lists.febo.com> escreveu: > >> Every APC UPS I've seen connects the batteries in series up to 24V. >> Above >> that, the battery voltage is either 24V or 48V depending on the model. >> >> If you search for the UPS model number and "replacement battery" you'll >> find a lot of third party vendors with pictures and often specs of the >> battery. >> >> On Mon, Jun 26, 2023, 12:14 PM Dave via time-nuts < >> time-nuts@lists.febo.com> >> wrote: >> >> > Hi, I managed to find two second hand UPS at a ham rally but neither had >> > a battery pack in it >> > >> > One, an "APC backups-ups 400" works well with a single 12V 7Ah sealed >> > lead acid battery. >> > >> > The other, an "APC SMART-UPS 600" seems to have space for two batteries. >> > >> > I have found a manual for the "600" unit but it mentions nothing about >> > the number of batteries or if they should be connected in series or >> > parallel :-( >> > >> > Has anyone any experience of these ?? >> > >> > Any help more than welcome. >> > >> > Regards, >> > Dave >> > >> > _______________________________________________ >> > time-nuts mailing list -- time-nuts@lists.febo.com >> > To unsubscribe send an email to time-nuts-leave@lists.febo.com >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-leave@lists.febo.com >> >