These are usually for the UK/RT320 [PRC320] manpack.
If they've been left uncharged for a year or so they're probably only worth selling for the value of the case [to be restuffed with modern batteries] because the 1980s-era Nicads really don't like inactivity.
See here:
http://www.vmarsmanuals.co.uk/newsle...manbattery.pdf