I remember seeing those for the old motorolas. Not anymore though, modern phones are smaller than the diameter of an AA or AAA.
The best I could figure out is finding a small flip ohone with external removable battery pack like the old motorola, then a second battery and desktop charger like the old motorola so I have two charged batteries at all times. Then a travel charger in the BOB and vehicle charger in the truck and a battery clip for it.