Canon PowerShot SX40 HS Battery and Charger - Replacement for Canon NB-10L Digital Camera Batteries and Chargers (1000mAh, 7.4V, Lithium-Ion) - Walmart.com
Canon SX40 HS Camera Battery Door Contact Replacement - iFixit Repair Guide
7.4V 1300mAh NB-10L NB 10L Camera Battery for Canon SX40 HS SX40HS SX50 HS SX50HS G1 X G1X G15 G16 SX60 HS G3X Camera Batteries - AliExpress
NB-10L Replacement Battery and USB Dual Charger for Canon SX40 HS SX40HS SX50 PowerShot SX40 HS SX50 HS SX60 HS - AliExpress
Canon PowerShot SX40 HS Battery and Charger - Replacement for Canon NB-10L Digital Camera Batteries and Chargers (1000mAh, 7.4V, Lithium-Ion) - Walmart.com
Amazon.com : BM Premium 2 Pack of NB-10L Battery and Charger Kit for Canon PowerShot G15, G16, G1X, G3X, SX40 HS, SX40HS, SX50 HS, SX60 HS Digital Camera : Electronics
Amazon.com : Canon PowerShot SX40 HS Digital Camera Battery Lithium-Ion 1200mAh - Replacement for Canon NB10L Battery : Electronics