Pros: USB Port delivers 5V and i tested it up to 3A! Amazing! The output port is 5.5 x 2.1 mm and is pre set to 12V. Can be adjusted within the box up to 24V. I use the 12V for my little chinese power amp (last photo) which works great! Cons: Input is 3.5 x 1.35 mm and you must use a stable 8.4V power supply to recharge the box. There is no charging circuit in the box so if you exceed 8.4V you will blow up your batteries. There are also no lamps glowing when in charging mode!

Pros: USB Port delivers 5V and i tested it up to 3A! Amazing! The output port is 5.5 x 2.1 mm and is pre set to 12V. Can be adjusted within the box up to 24V. I use the 12V for my little chinese power amp (last photo) which works great! Cons: Input is 3.5 x 1.35 mm and you must use a stable 8.4V power supply to recharge the box. There is no charging circuit in the box so if you exceed 8.4V you will blow up your batteries. There are also no lamps glowing when in charging mode!

Pros: USB Port delivers 5V and i tested it up to 3A! Amazing! The output port is 5.5 x 2.1 mm and is pre set to 12V. Can be adjusted within the box up to 24V. I use the 12V for my little chinese power amp (last photo) which works great! Cons: Input is 3.5 x 1.35 mm and you must use a stable 8.4V power supply to recharge the box. There is no charging circuit in the box so if you exceed 8.4V you will blow up your batteries. There are also no lamps glowing when in charging mode!

This is a nice case for 4pcs of 18650 unprotected cells it can easili recharge your phone but even the laptop or tablet or whatever. Only downside is that you can use just 15W of output power for the round 5.5mm connector. It is a good choice for easy set up of a powerbank. Thums up.

This is a nice case for 4pcs of 18650 unprotected cells it can easili recharge your phone but even the laptop or tablet or whatever. Only downside is that you can use just 15W of output power for the round 5.5mm connector. It is a good choice for easy set up of a powerbank. Thums up.

This is a nice case for 4pcs of 18650 unprotected cells it can easili recharge your phone but even the laptop or tablet or whatever. Only downside is that you can use just 15W of output power for the round 5.5mm connector. It is a good choice for easy set up of a powerbank. Thums up.