Working Supersize 9 Volt Battery Made From Old Lead Acid Cells : 11 Steps (with Pictures) - Instructables
Tenergy 9V NiMH Battery, High Capacity 250mAh Rechargeable 9 Volt Batteries for Smoke Detector/Alarms, TENS Unit, Metal Detector, and More (4 Pack) : Amazon.ca: Electronics
IT 9-6 F1 - Infinity 6volt - 9Ah SLA Battery - F1 - Vancouver Battery Corp