Extension Cable (20cm) is LEGO set 8886-1. It has a score of 81. This is average compared to all other sets. The set is recommended by 1 reviews, based on 4 scored reviews and 4 reviews total. It is ranked in the top 45.66% scored sets on Brick Insights. We know this set was released in 2008, and it is categorised in Power Functions.
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Works as expected.
I tested the cable, and found that it could power old 9V systems from the new battery box or an IR receiver. The only difference was that motors don't stop immediately after you turn it off, like they usually did with the old battery box. This cable also powers new motors from the old battery box, but it cannot power an IR receiver, which requires the new battery box and all 4 wires of the new cable. (This cable only converts the 2 motor-powering wires.)