As i stated in previous post to you, (Camel Crush) I will vote in a few days....Well today is the day.... My vote is you get a PCC for your 510...
Why?
I believe as a Prison Guard you would need something that will last at least 8-12 hours...And since you are not exactly sure if you will have access to a wall charger,the PCC is your best bet....That is just my Personnel opinion....
Thanks and Good luck.....