Amazon.com: HXJNLDC DC 3.7V 5000mAh 955565 li-ion Lithium Ion Polymer Battery Replacement for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Electronics
Battery Technologies - SparkFun Learn
Lithium Polymer battery and cells technical
What do you need to know about your lithium ion battery voltage?-Tycorun Batteries
Li-ion Voltage Analysis
Resources | Powersim, Inc
Is it true that lithium ion batteries only come in 1.5v each, and to up the voltage you have to connect them in a battery pack? - Quora