I have found this free link on BT site for you
http://www.shop.bt.com/content/uni2/documentation/498n/025455.pdf
If the second handset works ok on the base and the first handset doesn't, then you are right...the fault lies with the first handset. There are batteries ( special type ) in the handset, it sound as if either the batteries are dead, or not charged ( try charging them for 12 hours on the good base station ) or the connection is bad.
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