Central locking issue
 

Hello...I'm new to the forum...
I have a 2005 2.8 Grand Voyager and the central locking has started to play up. It will NOT work with the fob UNLESS the key is in the ignition and it is turned to ''ON''. I recently replaced the car battery and since then the radio has also stopped working ( no power ) and the dials 'flip' when the key is turned. I've read where it seems that the battery is not strong enough.. The battery is an Optima CCA (EN) - 815A....CA-1000A....C20-50Ah...Spiral Size-RTC42......thats all the information on the top of the battery. I've taken the lead from the battery and left it off for a while..reconnected it but its still the same...I've also taken the IOD fuse out....and all other fuses are ok.
Hoping someone can shed some light on this.
Thanks.