Amazon.com: PKCELL ICR17500 Battery 3.7V 1100mah A Size Lithium Rechargeable Batteries with Flat Top 2pcs(They are not 1865mm Size Battery) : Health & Household
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Lithium Ion Battery Pack - 3.7V 4400mAh : ID 354 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
3.7V Rechargeable Lithium ion Battery LP18650A+ 3500mAh With PCM and JST XHP-2 Connector