this may sound stupid, but if i buy active p'ups, i gotta put the battery somewhere right, would i have to route a battery cavity?

guitar is a schecter blackjack, it looks like a 9 volt will fit inside but it will just dangle there, and im not sure if they wire for the battery will be long enough

Schecter Blackjack C-1/C-7
Ovation Balladeer
Mesa F30
DanL Chorus
Bad Horsie Wah
EB Volume Pedal
you can put it in the control cavity.
Ibanez RG321MH (Air Classic/Tone Zone)
Fernandes Telecaster (Twang King/stock bridge pickup)
Blackstar HT-20 (Scumback 55 speaker/ Tung Sol tubes)
TC Electronic Nova Repeater
Lava Cables Clear Connect, Soar and Mini ELC