Canon PowerShot SX40 HS Battery and Charger - Replacement for Canon NB-10L Digital Camera Batteries and Chargers (1000mAh, 7.4V, Lithium-Ion) - Walmart.com
UpStart Battery Canon NB-10L Battery - Replacement for Canon NB-10L Digital Camera Battery (1000mAh, 7.4V, Lithium-Ion) - Walmart.com
NB-10L Battery for Canon PowerShot SX40 SX50 SX60 HS G1 G3 X G15 G16 | eBay
Best Buy: Digipower Re-Fuel Rechargeable Lithium-Ion Replacement Battery for Canon NB-10L RF-CN10L