i know that for US Radios there have been rechargeable batteries since around the first gulf war. and are among the more highly used batteries in the military as they reduce training costs as well as the number of logpacs needed during combat. most combat units have chargers for radio batteries pushed down to platoon level (mounted in vehicles) and non combat units tend to keep them at company level.
in addition there are adapters to use commercial batteries for SINCGARS, PRC77 and even PRC25 radios.
http://www.prc68.com/P/Prod.html
has several of these adapters.