Can be used for USB Lights were you don't have electricity
NEW MOBILE Power Bank that works with USB
SQUID Mini 4000MAH Power Bank
Model: XP61031
Battery Type: Grade A Li-ion
Capacity: 4000mAh
Output: 2.1A
Colour: Black,
Print Type: Lighting Logo
Product dimensions: 85 x 43 x 23mm
Packaging: Gift box
Weight: 125g
Compliance: CE - RoHS
Minimum order: 25
Lead Time: 3-4 weeks from artwork approval
Category: Power Banks00mAh Lighting Logo Power Bank For Mobile Phone

Price for one €15 or 3 for €30