ViewSonic JM4 Pro 50000mAh Power Bank Dark

ViewSonic JM4 Pro 50000mAh Power Bank

The ViewSonic JM4 Pro is a high-capacity portable charger with a 50000mAh lithium polymer cell. It integrates four built-in cables — USB-C, Lightning, Micro-USB and USB-A — alongside a bidirectional USB-C port and two USB-A outputs. Up to six devices can draw power simultaneously, making it suitable for users who carry phones, tablets, earbuds and smartwatches on extended trips or during outages.

Check your devices' charging inputs

The power bank delivers up to 22.5W through PD 3.0 and QC 4.0 protocols, automatically negotiating the optimal rate for each connected device. Verify that your hardware supports these standards to reach the advertised 65% charge on an iPhone 17 in 30 minutes. The unit recharges via the bidirectional USB-C port or the dedicated Micro-USB input, so confirm you have a compatible wall charger and cable for the input you intend to use.

Fits in a bag, replaces a tangle of cords

At 5.61 in x 2.88 in x 1.12 in and 1.11 lb, the dark-coloured brick slides into a backpack pocket while eliminating the need to pack separate cables for USB-C, Lightning and Micro-USB devices. The six-output layout lets a group top up phones, a tablet, a Switch and earbuds from one source, freeing wall outlets in cafés, vehicles or campsites. A digital display shows remaining capacity so you know when the bank itself needs recharging.