Thanks useful information: 
Take additional care with this. I bought a very similar thing to power a digital radio after the original lead gave up the ghost. You attach the different plugs to the main lead by way of two pins that plug into the lead. Be very careful that you have them the right way around because I accidentally reversed them and it stuffed my battery, which cost about $60 from memory.
EDIT: Just read John's post and clearly I reversed the polarity.
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