Vauxhall ASTRA Owner's Manual page 340

Electrical system
Battery, Voltage
Amp hours
Battery for remote control of
central locking system and electronic key
of Open&Start system
Technical data
12 Volt
36 Ah / 44 Ah 3 / 55 Ah 3 / 60 Ah 3 /
66 Ah 3 / 70 Ah 3
CR 20 32
335