Do I need to re-install or anything? Or is it simply a case of adding the line to the .ini file please? T From: bvipilots-bounce@xxxxxxxxxxxxx [mailto:bvipilots-bounce@xxxxxxxxxxxxx] On Behalf Of Robert Cezar Sent: 30 March 2012 17:34 To: bvipilots@xxxxxxxxxxxxx Subject: [bvipilots] Re: IYP VA Checklists. Hello Tony, The MagicBattery=Yes definitely works... I can assure you of that. If you have a registered version of FSUIPC4, please try to activate the option via the Miscellaneous Tab. With MagicBattery=Yes, I can leave to Battery on for days! <LOL> Incidentally, the APU is a "virtual" function. There is no connection to the actual buss in the simulator. I hope this helps. Regards, Robert On Fri, Mar 30, 2012 at 9:03 AM, Tony <tonys_groups@xxxxxxxxxxxxxx> wrote: Hi All If you're planning on flying a 737 for IYP Air, My advice to you is execute the pre-flight checklist at the last possible moment, to prevent the battery from running out before you've had a chance to start the engines. I added the line MagicBattery=Yes to FSUIPC4.INI, within the General section, and this made no difference. If anyone has successfully added this switch, I'd be delighted to hear about it. I would have thought that FSX would allow the APU to keep things alive before the engines are started, but no. T -- <http://www.itsyourplane.com/10000.jpg> AOPA Member No: 06936977