ViewSonic
ViewSonic JM4 Pro 50000mAh Power Bank Dark
A 50000mAh power bank with four built-in cables, 22.5W fast charging and a digital display powers up to six devices at once
- Type50000 milliamp_hours
- ColorDark
- Compatible Phone ManufactureriPhone 17, 17 Plus, 17 Pro, 17 Pro Max, iPhone 16, 16 Plus,
- Compatible Phone ModeliPhone 17, 17 Plus, 17 Pro, 17 Pro Max, iPhone 16, 16 Plus,
- Capacity50000 milliamp_hours
- Chemicallithium_polymer
- 50000mAh capacity delivers over 10 full charges for iPhone 17
- Built-in USB-C, iOS, Micro-USB and USB-A cables eliminate need for extra cords
- 5W fast charging with PD 3.0 and QC 4.0 reaches 65% in 30 minutes
- Six outputs plus two inputs charge up to six devices simultaneously
- LED display shows remaining power at a glance
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.
Highlights
- 50000mAh capacity delivers over 10 full charges for iPhone 17
- Built-in USB-C, iOS, Micro-USB and USB-A cables eliminate need for extra cords
- 5W fast charging with PD 3.0 and QC 4.0 reaches 65% in 30 minutes
- Six outputs plus two inputs charge up to six devices simultaneously
- LED display shows remaining power at a glance
Specifications
| Brand | ViewSonic |
|---|---|
| Model | JM4 Pro |
| Type | 50000 milliamp_hours |
| Color | Dark |
| Part Number | JM4 Pro |
| Compatible Phone Manufacturer | iPhone 17, 17 Plus, 17 Pro, 17 Pro Max, iPhone 16, 16 Plus, 16 Pro, 16 Pro Max, iPhone 15, 15 Plus, 15 Pro, 15 Pro Max, iPhone 14, 14 Plus, 14 Pro, 14 Pro Max, iPhone13 Pro, iPhone 13 Pro Max, iPhone 13 mini, iPhone 13, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 12 mini, iPhone 12, iPhone 11 Pro, iPhone 11 Pro Max, iPhone 11, iPhone SE (2nd generation), iPhone XS, iPhone XS Max, iPhone XR, iPhone X, iPhone 8, iPhone 8 Plus |
| Compatible Phone Model | iPhone 17, 17 Plus, 17 Pro, 17 Pro Max, iPhone 16, 16 Plus, 16 Pro, 16 Pro Max, iPhone 15, 15 Plus, 15 Pro, 15 Pro Max, iPhone 14, 14 Plus, 14 Pro, 14 Pro Max, iPhone13 Pro, iPhone 13 Pro Max, iPhone 13 mini, iPhone 13, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 12 mini, iPhone 12, iPhone 11 Pro, iPhone 11 Pro Max, iPhone 11, iPhone SE (2nd generation), iPhone XS, iPhone XS Max, iPhone XR, iPhone X, iPhone 8, iPhone 8 Plus |
| Capacity | 50000 milliamp_hours |
| Chemical | lithium_polymer |
| Volt | 3.7 volts |
| Dimension | 5.61 in x 2.88 in x 1.12 in |
| Weight | 1.11 lb |
Questions about this item
What comes in the box and do I need to buy any cables separately?
The power bank has built-in USB-C, iOS, Micro-USB and USB-A cables plus a bidirectional USB-C port and two USB-A outputs, so no extra cables are required for up to six devices.
Which capacity version should I choose for multiple phone charges?
The single 50000mAh model delivers over 10 full charges for an iPhone 17, making it suited for extended trips or charging several devices.
What does the 22.5W rating mean when I plug in my phone?
With PD 3.0 and QC 4.0 the bank can charge an iPhone 17 from 0% to about 65% in 30 minutes under compatible conditions.
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