Car Alarms: dead battery alarm goes off when new one is installed, valet mode, fcc number

Question
I have a 1998 Toyota avalon, the battery died after sitting for a couple of months. When I tried to jump start it the alarm went off. I removed the battery charged it and alarm goes off when I try to connect the battery. This is my mothers old car I am not sure what to do.
The FCC number on remote key (which no longer works is FCC H5063)

Answer
Seems the system is reset, and needs
to be done again.

Probably when, it lost power.

Right, Ok, try this.
Put the key in the ignition, and turn forward
all the way just before cranking. Then within
5 seconds, press and hold in the valet/overide
button, found under the dash area, usually to the left
of the leg, drilled into a plactic panel,
until the installed LED (the blinking light)
in your dash area goes off, and the siren chirps twice.
(Your valet switch might be the toggle (on/off) type.
in this case, key on, flip switch in oposite direction,
key off.)

This should reset the alarm and allow you to
go on your way.

Just Repeat these steps to place it
back to valet mode.

That should do it.

Good luck.

ALARMTEK