I checked my mates handset as his has the original Sanwa NiCad and his is same as mine red wire, middle pin and black wire top pin so I decided to try connecting the battery WITHOUT swapping the wires over as per Martyn's picture and..... The plug didn't fit. So I swapped the plug for the Sanwa one but kept the wire opposite to Martyn's picture and.... It worked!
It may be simply red to red black to black but I was just questioning information that someone had posted. I am an electrically trained engineer so think I know what I'm doing but it can be dangerous to post comments like "order this battery, swap the wires over and hey presto" because it may not necessarily be right for every handset
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