Review: Oittm 5,000mAh Magnetic Portable Charger for Apple Watch

Oittm 5,000mAh Magnetic Portable Charger for Apple Watch











  • It's able to charge a Apple Watch and smartphone at the same time
  • The USB-A port has a 5V/2.1A charging rate, quite rare for a Apple Watch portable charger to feature

Power banks are one of the best types of charging electronics that you can use on the market because of the versatility that they have. The versatility that we’re talking about is how they’re able to be taken anywhere and still have charging tech that can be helpful to use anywhere that you go. For example, there are now quite a lot of USB-C Power Delivery portable chargers on the market and the result of that is you’re able to charge quite a few USB-C compatible laptops on the market quite easily without needing an AC outlet.

This is basically what has happened to chargers for the Apple Watch, as there are now portable chargers that use a Magnetic charger that you can use to charge your Apple Watch. That’s what this Ottim Magnetic Apple Watch portable charger features, so you’re able to charge your Apple Watch while you’re away from an AC outlet.


Power Capacity:

The power capacity of most Apple Watch power banks is on the low side, and these are basically mini portable chargers that we’re dealing with here. That’s exactly what this Ottim power bank is, as it has 5,000mAh power capacity. This capacity is on the higher-end when it comes to mini power banks, so you’re able to supply quite a lot more full charges to not only your Apple Watch but also for other devices that you might charge with this power bank as it has a USB-A port.

3.7 x 5,000 = 18500 / 5 = 3,700

DevicesOittm 5,000mAh Magnetic Portable Charger (Output Capacity = 3,700mAh)Device CapacityOittm 5,000mAh Magnetic Portable Charger Left Over Capacity after One Charge

# of Full Charges for the Device
Apple Watch3,700mAh250mAh3450mAh Left Over Capacity

14.8 Full Charges
Apple Watch Series 33,700mAh279mAh3421mAh Left Over Capacity

13.2 Full Charges
iPhone 7 Plus3,700mAh2,900mAh800mAh Left Over Capacity

1.2 Full Charges
iPhone 83,700mAh1,821mAh1879mAh Left Over Capacity

2.0 Full Charges
iPhone 8 Plus3,700mAh2,691mAh1009mAh Left Over Capacity

1.3 Full Charges
iPhone X3,700mAh2,716mAh984mAh Left Over Capacity

1.3 Full Charges

Of the 5,000mAh that these power banks start out with, you’re able to use about 3,700mAh of it. This is still a good amount of power for charging the Apple Watch, as the regular Apple Watch has a 250mAh battery, of course, that’s a very low capacity because it’s a watch and it uses a very tiny battery. The Apple Watch Series 3, the latest model, has a slightly higher battery with a 279mAh battery.

So if you’re solely using this power bank for charging your Apple Watch, then you can expect to get about 14 full charges. That said, since this Oittm power bank also uses a USB-A port, you can also charge smartphones with it and you’re likely able to get a single full charge for most smartphones on the market. However, if you do plan on charging a smartphone, just remember that it’ll likely take the entire power capacity to do so and you might not have enough power capacity to charge your Apple Watch.

For the power capacity that’s available, there’s still a lot if you want to just charge your smartphone a little bit.

Output Charging:

The magnetic charging for the Apple Watch on this power bank has a 5V/1.0A charging speed, and that’s basically the max charging speed of the Apple Watch.

The charging speed of the USB-A port is 5V/2.1A and it’s quite a fast standard charging speed, but don’t expect Quick Charge as the port does not feature Quick Charge tech. Still, though, we’re glad to see that the USB-A port has at least a charging speed higher than 1 Amp.

Input Charging:

To recharge this power bank, it’s done through the Micro-USB input and it has a max recharge speed of 5V/1.8A. So to recharge this Oittm power bank at max speed, we recommend that you use a 2 Amp wall charger or higher, as that will result in about a 2 hour full recharge time.


Size and Weight:

This is indeed a mini power bank as the charger has a length of 4.9 inches, a width of 1.6 inches and a thickness of 0.9 inches. The weight of the power bank is 5.7 Ounces. So you can very well just place this power bank into a pocket and not have to worry about it slowing you down. Holding it while you charge a smartphone and use your smartphone at the same time is also quite easy.

Of course, when it comes time to charge your Apple Watch, you are going to have to place this power bank down.

Functional Components:

The power bank is very easy to use, with the top consisting of the magnetic charger that you can lay your Apple Watch on for charging. Also at the top is where there are two rows of LED lights that show the amount of power capacity that’s left.

Off to the left side is where the USB-A port is, and then on the opposite long length side is where you’ll find the power button and the Micro-USB input port for recharging. You do have to press the power button to begin charging from both the USB-A port and the Magnetic Charger.


Structure and Material:

The build quality of this Oittm power bank is very good as it has an Aluminum Alloy center and the two sides caps are made of plastic. We can tell that Oittm really wanted to put some Apple DNA into the build and we think that they succeeded.


On the tech side, the power bank does get a little warm if you’re charging an Apple Watch, but only slightly and that’s quite common when it comes to magnetic charging in general.


This Oittm magnetic portable charger for an Apple Watch is absolutely reliable with its power capacity that can charge an Apple Watch into the double digits, and it can also charge a smartphone to full power. That said, this isn’t the most reliable power bank for charging a smartphone to full power and still having leftover power capacity. The use of a USB-A port is still welcoming though if you do need to charge your iPhone or any other smartphone.



The power capacity of this Oittm power bank is quite plentiful and you’re able to charge an Apple Watch to its full power multiple times.


It’s an easy power bank to use with minimal functional parts and the magnetic charger for charging your watch is front and center. Also, the power bank is able to lay flat so there’s no trouble with aligning your watch to charge.


The build is quite good with the power bank having a solid structure and it’s basically on par with Apple’s product feel.


It’s able to provide multiple charges to an Apple Watch and charge a smartphone to full power about a single time. It all comes in a small form factor that you can fit into a pocket.

Specs of the Oittm 5,000mAh Magnetic Portable Charger for Apple Watch:

  • Power Capacity: 5,000mAh | Output Capacity: 3,700mAh
  • Output:

Apple Watch Magnetic Charger: 5V/1.0A

Standard Port: 5V/2.1A

  • Input: 5V/1.8A
  • LED Power Indicator: Four LED Power Capacity Indicators
  • Size: 4.9 x 1.6 x 0.9 inches
  • Weight: 5.7 Ounces


Apple Watch portable chargers are a great idea, as you may not have access to an AC outlet, and this Oittm power bank proves just that with its use of a magnetic charger and an additional USB-A port that goes the extra mile with how you’re able to use this power bank.

Oittm 5000mAh Portable Charger, [Apple MFi Certified] Wireless Magnetic Charger for Apple Watch Travel Power Bank External Battery for Apple Watch Series 3, iPhone X, iPhone 8/8 Plus, Samsung & More

 out of stock
as of May 7, 2022 10:55 pm


  • Portable Dual-Charging: With a built-in Magnetic Charging Module to wireless recharge the Apple Watch, as well as USB out port for charging any Phones. Get rid of annoying Apple charger with a 3ft cable. Charges fast as original apple watch charging cable. Compatible with Apple Watch Series 3/2/1 all models
  • Powerful Battery and Fast Recharging: Ideal emergency power bank add 6 charges to Apple Watch or 2 charges to iPhone 7. Supports charging devices even it is being charged, keeps up with your busy lifestyle. Fully recharged in just 3 hours with a 2.4A adapter.
  • Super Compact and Lightweight: Handy-sized design perfect for long flights, road trips and travelling. Slim enough to slide effortlessly into any bag. The LED indicator displays battery levels and charge status. Do a quick power-check on the go.
  • Certified Safe Charging: Apple MFi Certified product ensures high quality performance and reliability. Multiple safety system provides protection against over-charge, over-current, over-voltage, short-circuit. Smart chip detects connected devices for faster charging.
  • What You Get: Oittm 5000 mAh Portable Charger External Battery x1; Micro USB Cable x1; User Manuel x1. Backed with 60-DAY Money Back Guarantee + Lifetime Warranty with free technical support