... 7v 4000mah within PCM protection +wire welcome OEM Key words18650 li ion battery pack 3.7v 4000mAh 1 Type: lithium ... 4000mAh 4 CE/UL/RoHs approved18650 li-ion battery pack 3.7V 4000mAhSpecifications:1. Type: Li-ion battery2. Size: D18*36* ... phone, solar lighting, electrical drill, shaver, emergency lighting, back-up power,cordless tool, power tool, flashlight, torch etc… rechargeable li-ion 3.7v ...