The models of the 996 997 series are known for their comparatively high quiescent current consumption, so that the heavy starter battery fitted as standard can no longer provide sufficient starting power after just a few weeks of inactivity…
“Same issue with the 997 and 991 Porsches.
They drain the batteries within a few days.
Since I’ve had a LiteBlox in my 997, I’ve had 0 problems.
And you can’t save 20kg more cheaply than with a battery like this!” (lukecustoms)
Our customer OK-Chiptuning has now replaced the old lead-acid car battery with our innovative LB28XX LiFePO4 accumulator plus matching 99X adapter plate and can now conveniently disconnect its Porsche 996 turbo from the battery with our smartphone app when it is parked for a longer period of time: 
