Oh dear, just open the control panel, with the 'mains on', you should get a tamper sound, enter your code to silence.
Remove the old battery & replace with a 7Amp.
Close the panel, enter your user code, once/twice, (can't remember), job done.
There is no reason to default the controls, you will have an even bigger problem if you do that.
Why default a perfectly good control panel.
By the way the User manual will be of NO USE to you to re-programme, that's what it is, a User Manual not the Installation & Programming Manual.
Do the above, get back again if you have further problems.
acorn
September 2010