4 x AA Battery Holder with 2.1mm Plug : ID 3784 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Batteries - Household - FMCG Distributors
Energizer Ultimate Lithium AA Batteries (8 Pack), Double A Batteries - Walmart.com
Alpine Corporation Ni-CD Replacement for Solar Powered Garden Lights Rechargeable Nickel Cadmium (Nicd) AA Batteries (4-Pack) in the AA Batteries department at Lowes.com
Tenergy 8.4v 1600mAh NiMH Mini Stick Battery
Duracell Coppertop AA Battery with POWER BOOST™, 8 Pack Long-Lasting Batteries - Walmart.com
NOCO - 4 Bank 8A Smart Battery Charger - GENIUS2X4