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HiYa Gordy, even if the interior lights were all left on by accident or even deliberately they should ALL be switched off [sleep mode] by the BCM software about 15 minutes after locking the vehicle up. With me it is / was / continues to be (self inflicted) 'lifestyle' x2 15 minute trips in the summer will replace the starting draw value but will go nowhere close to replacing the starting draw value in the winter. I see the MOD as a purse / bank ... you are deffo going to run out of banked-starts ... when it will happen depends on how big and how full the bank is in the 1st place. frogland. Lots of people have done the batteryMOD, all 100% effective, zero reports of any problems, here's my original post on the subject :

Yes I've got your bigger battery choice as well, having to cut a bit of battery tray out. Worth while job. I got rid of my battery drain problem by turning off interior lights at the adjuster wheel every time I get out. P0235 still on going with my car, goes into temp limp mod if I boot it. Thought to be over-boost with Turbo waste-gate not being operated by the actuator. Had the complete shutdown issue on booting it but Boost sensor sorted that.

If is 12.5v after one overnight it is something wrong with the electrics. I bet if left two three days it does not start anymore, if I were you I would investigate further... As per the fault code, have you ruled out the sensor first, I don't remember exactly but I gave these tests to someone else as well: -pin 3 and 5(plug disconnected) testing the maf sensor you should have 336000 ohmi with 18 Celsius outside -4 and 5 disconnected testing the maf sensor you should have 340000 ohmi -2 and earth disconnected testing the supply( wiring) with ignition on you should have 11-14 v -3 and 4 plug connected engine at idle you should have 5v 3 and 5 plug connected engine at idle you should have 1.6v Same fault code applies for the turbocharger boost pressure sensor and test is as per below: -pin 1 and 4 connected and engine at idle you should have 1.6v -pin 1 and 4 connected engine at 2500 rpm you should have 2v. Hope it helps.