If it is only 6 months old I would have thought it is still in warrenty if you can find the receipt.
They don't know what you have been using it for. See if they will replace it.
Failing that I bought the below. Good batteries, light and powerful. Makes finding a home for it a lot easier.
http://www.ebay.co.uk/itm/Odyssey-PC...em2ebd2 e6f8a