Hi There
It would be fifteen years old. I have purchased an Icom A3 which now suits my needs better than the A20.
The new battery is Ni-Cad and works fine. A lot of pilots still use the A20 and it is compatable with Ga headsets and other intercom systems.
I previously had an A20 on my Quantum with a Communica system. All worked fine but was sold as a job lot. I intend on using the A3 on my Chaser where I need a smaller radio.
Hope this helps.
Give me a ring if you need any further information
Adam