ChiliPower NB-6L, CB-2LY 1100Ah Battery for Canon PowerShot D10, D20, S90, S95, S120, SD770 IS, SD980 IS, SD1200 IS, SD1300 IS, SD3500 IS, SD4000 IS, SX170 IS, SX240 HS, SX260 HS, SX270 HS, SX280 HS, SX500 IS, SX510 HS, ELPH 500 HS, Ixus 25 IS, 85 IS, 95 IS, Digital Ixus 105, 200 IS, 210 (Electronics)
This battery lasts as long as the original, and costs 5 times cheaper. After, you will see the length if it preserves its autonomy, but I'm very satisfied for the moment.