Cool gadget! Chance upon this charge card reader on BeautyQQ's YouTube Channel. This gadget is a battery charger as shown below & also a card reader, that comes in the form of a key chain.
Here I tried charging my Sony Ericsson W995 battery which works. Though it will be slower than the USB charger that comes with the phone but this will definitely be a life saver when you don't have your charger with you.
Not sure if this can be found in Singapore since this is a gift from someone who bought it in Hong Kong for HK$25. Do keep a lookout for such gadget when you are out & about town.