Now you have an INTERCHANGEABLE SYSTEM, and you can use the "Adapta-Plugs" to power OTHER 12V devices off your battery if you want.
I used to do this, but I found the RS adaptaplugs so damn finicky - sometimes would plug in securely, often times wouldn't - I bailed and just started hacking my wallwart cables.
Don't wanna be a contrarian here Bri,
There are a number of different connectors that are REAL CLOSE (same outside diameter, different inside diameter, etc.). I've made that error a couple of times (and PAID for it). Sony (on thier laptops) are NOTORIOUS for making non-standard size plugs - real hard to find a match that feels perfect.
This (like whether you like the sound of your mikes/preamp/speakers/DIN/NOS.XY/ETC/ETC) - really comes down to personal preference.
I enjoy the versatility of the adaptaplugs and they work for me, others like the snug, secure feeling of slaughtering an innocent wallwart...
They ALL work - do what you feel comfortable with...
Rick