10pcs 3.7v 21700 4000mAh Lithium battery cell 5C 20A high capacity Not 3750mah 21700 for diy pack power tool long cycle life EV|Replacement Batteries| - AliExpress
10PCS ER18505 4000mAh 3.6V Li-SOCl2 Size A Batteries for Water/Gas Meter | eBay
itel on Twitter: "Small doesn't always mean weak and with itel P32, small definitely means stronger. With a 4000mAh battery packaged in an 8.8mm slim body, itel P32 gives you 3 days
RDQ Series 22.2V 6S 4000mAh 70C LiPo Battery - XT90
Xiaomi Can Recharge a 4,000mAh Battery in 17 Minutes | PCMag
C Rechargeable 4000mAh 100%PeakPower NiMH Batteries - Pack of 8