Lithium Ion Battery Pack - 3.7V 6600mAh : ID 353 : $24.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Amazon.com: ABENIC DC12V Super Polymer Rechargeable 20000mAh Lithium ion Battery Pack 2A (24W),for Aviation Models Portable DVDs, MP3 Players and More,Power Bank with Charger(Blue) : Electronics
Embeddinator 11.1 V Lithium ION Rechargeable 3 Cell Battery Pack for Industrial, Robotics, Project Work : Amazon.in: Electronics
MAENT® 12V Li-ion 18650 Lithium ion Rechargeable Battery Pack 3S1P 11.1V 12.6V Battery Pack for GPS i Pod P sp/DVD/mp4 CCTV Camera DVR Backup Tablet PC Project Work Industrial Equipment (1200 Mah) :
Some important Points before designing a Li - ion battery pack
High Quality 3.2v 100ah Liion Lifepo4 Lithium Ion Battery Pack For Solar...
Lithium Ion Battery Pack, 3.7 V, for Solar Appliances
Lithium Battery Pack LiFePO4 12V 560Ah | Energetech Solar
Lithium-ion battery packs | VARTA AG
Analyzing Thermal Distribution in a Li-Ion Battery Pack | COMSOL Blog