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For a detailed pictorial guide on replacing RTC batteries, refer to the guide here.

Leaking Batteries
There is a battery on the Amiga 3000's motherboard which keeps the
clock up and running, plus keeps the parameter RAM set.  This RAM maintains
things like the SCSI controller ID, Synchronous bits, Timeout modes etc.

Many of these batteries have started to disintegrate, not only on
Amiga 3000's, but on A2000's, A501's and A4000's.  No system is free from
these issues:  Quickly check if your battery, often blue or red in a little
barrel shape on the left side of the A3000 motherboard, is leaking!  If it
is, you'll see little flecks of white acid crystallizing.  Many users even
reported that the battery had already started leaking onto the motherboard,
corroding the copper traces.   My own personal A4000 already had the
battery leaking.

What to do?  Immediately cut off, if not replace, the battery.  NOW.
Do it.  Many saw it, put it off, and later had their motherboard torn apart
and destroyed by acid because they didn't fix it fast enough.

To remove the battery, snip off the legs (in three points).  This
is recommended if you can't replace it immediately.  Be careful about
damaging chips around it.  You may wish to snip the rear pin and rock the
other two back and forth until it snaps easily.  This may even be a better
idea if you plan to replace it immediately-at least you won't get bits of
acid all over your board.

To replace, it's highly recommended you desolder the battery.
First, cut the battery off with a pair of snips.  Then, unscrew the
motherboard.  Yes, this is a pain in the ass.  There are tens of screws and
hex pins.  Once you've removed it, desolder the remaining legs of the old
battery.  Use a low power 15W iron with a very small pencil tip.  You may 
not need desoldering equipment, just heating the old solder up may let the 
old bit come out easily.  If this doesn't work, get desolder braid or a

Once all three old pins are out, put a new battery in place.
Replacement components are easily found at PC stores, electronics shops,
and some surplus stores.  You'll want a NiCad 3.6V 60 mAH component,
although nearly any 3.6V NiCad battery will work.  Ask especially for the
three legged model.  The two legged kind are electrically the same, but a
pain to put in.  Do not use Lithium batteries, these do not recharge and
could cause an explosion!

A good idea is to bring the old one in and ask for a
direct replacement.  Of course, make sure you package it before you
leave-use an old baby food jar or something.  Battery acid is a bad thing.

Other suggestions, include using cordless phone batteries 
and the like.  Use at your own risk.  

If you used desoldering equipment, the clean holes should present
no problem.  If you're cheap and you didn't, then try this idea-put the
battery in place, then heat up the old solder on the bottom side of the
motherboard.  Apply a little pressure to the battery. Physics should suck 
the leg into place with solder around it.  Repeat with each leg.

Start up your machine, and let it run for an hour or so to charge
up the new component, then shut down.  Power up to check if the date and
time are retained.

As for disposing the old battery, package correctly, and return to
your appropriate government recycling center, or even your local
electronics store like Radio Shack for proper disposal.  It may be illegal
in some places to put them in household garbage.  Feel free to curse at the
sucker before you toss it.