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Lithium Ion Battery - 3.7V 2000mAh : ID 2011 : $12.50 : Adafruit Industries, Unique & fun DIY electronics and kits
802030 550mah 3.7v Lithium Polymer Battery Mp3 Mp4 Mp5 Li Ion Massager Batteries Replacement In Neoline Evo Z1 Auto-register - Rechargeable Batteries - AliExpress
TPi electronic components GmbH :: Products :: Accumulators :: Standard Lithium Polymer Ionen Battery nominal voltage 3,7V
Amazon.com: DC 3.7V 1300mAh 503759 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Health & Household