The Canon NB-1LH battery fits most Powershot Digital Elph Cameras: S100, S110, S200, S230, S300, S330, S400, S410, and S500.
If, like me, you take a lot of photos you will have realized that after a few recharges the battery starts lasting for less and less time. Mine got so bad I looked around for a replacement Powershot battery and found a great deal:
Batteries made by Canon cost $58.99, but Amazon has what looks like a good discount, 32% off making the price $39.94. However, there are non-Canon batteries available from as little as $4 a battery plus $4.99 shipping.
“Brand new 14 days no-risk money back guarantee + warranty. Canon NB-1LH Equiv. made by 3rd party, NOT by Canon.”
You aren’t buying direct from Amazon but the sellers have a lot of positive feedback, I ordered one and it arrived promptly and works well.
Here’s the link for the Canon NB-1LH Battery Pack for Canon S100, S110, S200, S230, S300, S330, S400, S410 & S500, just click that link and look for “used & new from $4.00” on the right of the page, then scroll down to the $4.00 New battery listings.