Some (if not all) Dallas chips had Lithium batteries internally.
(I have the complete specs somewhere.)
                                        Rick Glazier

From: "Joe Lore" <[log in to unmask]>

> Batteries can come in all shapes and sizes and are sometimes not really
> batteries.
>
> There was a period of time the main board manufacturor's used a "RTC" or
> "Dallas" Clock chip instead of a battery.  This was common from 386 to P1
> systems.  They have all pretty much changed over to less costly batteries (
> cr2025 etc) since then.  RTC's are okay uless you leave the system off for
> a great deal of time.
>
> The RTC was really a capacitor that got charged when the mainboard was
> powered up and then would discharge

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