Burstner Nexxo t665 starter battery location

[Stacott]

I have just bought a 2010 Burstner Nexxo t665 bassed on a 2.2l diesel ford transit. If left for a day or two the starter battery goes flat. The only thing I can see that might be causing it is the display on the radio remains showing the date and time. The display is dull but I can turn the radio on, even without the key in the ignition.
1 Is this normal
2 Also, does anyone know the exact location of the starter battery. I have looked all over and cannot find it!

 

[LostInSpace]

1 Is this normal?

Very common.
Sounds like it might be the original battery. Time for a new one.

 

[mikash]

Transit starter battery is usually under the driver seat. If it's "winter specced," with parking heater, there might be two batteries in parallel.

 

[Burge]

Time for a New Battery and a Battery Master

 

[Alanf75]

In our old Chausson Transit base (2008), the starter and aux were under the drivers seat. Leisure battery under the passenger seat.