Gomadic Portable External Battery Charging Kit suitable for the Canon Powershot S90 Includes Wall; Car and USB Charge Options
Amazon.com : Wasabi Power Battery (2-Pack) and Charger for Canon NB-6L, NB-6LH, CB-2LY and Canon PowerShot D10, D20, D30, ELPH 500 HS, S90, S95, S120, SD770 IS, SD980 IS, SD1200 IS, SD1300
Kastar Quadruple Battery Charger Compatible with Canon Digital IXUS 105, Digital IXUS 105 IS, PowerShot D10, PowerShot D20, PowerShot D30, PowerShot ELPH 500 HS, PowerShot S90 Camera Camera Batteries & Chargers - Newegg.com
Amazon.com: Kastar Lithium-Ion Rechargeable Battery for Canon NB-6L, NB-6LH and PowerShot SD770 IS, SX170 IS, SX260 HS, SX280 HS, SX500 IS, SX510 HS, SX520 HS, SX530 HS, SX600 HS, SX610 HS, SX700
Canon S90
Amazon.com : MaximalPower Replacement Battery for Canon NB6L & Powershot S95, D10, SD1300 IS, S90 and SD1300IS Camera, 3 Year Warranty 2 Pack : Digital Camera Batteries : Electronics
Canon NB-6L NB-6LH 1450mAh Replacement Digital Camera Battery for Canon Powershot SD770, SD980, SD1200, SD1300, SD3500, SD4000, IS D10, D20, S90, S95, SX260, ELPH 500 HS & More + eCostConnection Micro -
Amazon.com : Canon PowerShot S90 10MP Digital Camera with 3.8x Wide Angle Optical Image Stabilized Zoom and 3-Inch LCD (OLD MODEL) : Point And Shoot Digital Cameras : Electronics