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What does the charging speed of battery-powered devices depend on?

The battery capacity is specified in milliampere hours (mAh) and determines the energy volume of a battery.

Different charging speeds result from the devices' integrated charging electronics, which regulate the optimised current intensity themselves depending on the requirements and charge status of the battery. The charging speed can be influenced by the current output provided by the charger or by the cable used.

USB chargers and power banks often only provide a current output of 1 A. This example* illustrates the difference to many InLine products with 2.1 A or 5 A output using a smartphone with a 2,500 mAh battery:

Output

Calculation

Charging time

 1 A 2,5 Ah / 1 A 2h und 30 Min.
2,1 A 2,5 Ah / 2,1 A 1h und 12 Min.
5 A 2,5 Ah / 5 A 30 Min.


*Ideal typical example with constant charging current without power loss

To maximise charging speed, all components used must be compatible with each other. Unsuitable cables often slow down the charging process as they cannot transmit the full current of the charger.

USB power supply units

InLine offers an extensive range of USB power supplies from small and compact to our maximum power of up to 140 W!
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InLine® USB Power Adapter DUO, 2 Port 100-240VAC to 5V / 2.1A white
Item no.: 31503W
The InLine® USB Power Adapter allows you to adapt the USB power directly from the wall socket, so you can for example use the adapter as a power source for USB mobile phone charger. Ideal suitable as USB AC Adapter / Charger for iPhone, iPad, iPod / ...
InLine® USB PD power supply, GaN charger, 5-port, USB-C + USB-A, 140W, w/display
Item no.: 31553
Flexible fast charging with consumption display and 140 W Real-time overview of consumption: Integrated display shows the current power in watts. Parallel fast charging across five ports: 3x USB-C with Power Delivery 3.0, 2x USB-A with Quick Charge 3...
InLine® USB car power adapter Power Delivery, 2x USB-C + QC USB-A, black
Item no.: 31502A
Fast in-vehicle charging with up to 100 W and three USB ports High-power notebook and tablet charging: USB-C1 with Power Delivery up to 100 W. Simultaneous charging on three ports: USB-C1 + USB-C2 + USB-A with 45 W + 30 W + 18 W in parallel. Fast cha...

USB charging cable

Whether USB-C, micro-USB, Lightning or notebook charging cable. At InLine you will find the right charging cable for your device.
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InLine® USB 2.0 cable, USB-C male/male 100W quick charger cable, 1m
InLine® USB-C Fast Charging Cable 100W
The USB-C cable is the perfect cable for fast charging of your smartphone or tablet with USB-C charging socket, it contains an intelligent E-Marker chip, which recognises the fastest charging option of the connected devices and prevents damage to har...
InLine® 3-in-1 USB Cable, USB-A M to Micro-USB+USB-C+Lightning, black/aluminium
Item no.: 31415S
Flexible charging and synchronizing with three connectors in one cable Three connectors in one cable: Connection for Lightning, USB-C and Micro-USB without swapping adapters. Simultaneous charging and data synchronization: Charge and synchronize smar...
InLine® USB-C Lightning cable, for iPad, iPhone, iPod, silver/aluminium, 2m
InLine® USB-C Lightning cable, for iPad, iPhone, iPod, MFi certified
This USB cable connects iPhone, iPad or iPod with a Lightning plug into the USB-C port of the computer. Synchronise, data transfer and charge your device using this cable over USB-C from your PC or Mac or use your power adapter for charging.Same time...
InLine® USB-C to HP Notebook (round/large) charging cable, 2m
Item no.: 26673
Charge a notebook with barrel plug via USB-C PD Expand USB-C PD charging option: Uses a USB-C power supply to charge notebooks with 7.4/5.0 mm barrel plug. Clearly defined output: Works with PD at 20 V and up to 3.25 A (65 W). Direct connection witho...
InLine® Lightning USB Cable, for iPad, iPhone, iPod, black/alu, 2m MFi-Certified
InLine® Lightning USB Cable, for iPad, iPhone, iPod, MFi-Certified
This USB cable connects iPhone, iPad or iPod with a Lightning plug into the USB port of the computer. Synchronise, data transfer and charge your device using this cable over USB from your PC or Mac or use your power adapter for charging.Same time syn...
InLine® USB 2in1 Y-charging cable, 1x USB-A plug to 2x USB-C plug, 2m
InLine® USB 2in1 Y-charging cable, 1x USB-A male to 2x USB-C male
Charges two USB-C devices simultaneously from one USB-A port Practical Y-design for less cable chaos Up to 25 watts of charging power for smaller devices Perfect for on the go, at home and in the office Compact, lightweight and versatile With the InL...
InLine® USB 4in1 Y-charging cable, 1x USB-A plug to 4x USB-C plug, 1m
InLine® USB 4in1 Y-charging cable, 1x USB-A male to 4x USB-C male
Charges four USB-C devices simultaneously from one USB-A port Practical Y-design for less cable chaos Up to 25 watts of charging power for smaller devices Perfect for on the go, at home and in the office Compact, lightweight and versatile With the In...