Review of Oittm Apple Watch Power Bank Keychain

Updated on July 7, 2018
Chriswillman90 profile image

Krzysztof is a lifelong future tech junkie investigating the latest stories from companies like Apple, Samsung, Google, and Amazon.


Oittm Apple Watch Power Bank Keychain

The Oittm Apple Watch Power Bank is an MFi Certified smart keychain that's designed to wirelessly charge your Apple Watch on the go.

The Power Bank comes with a micro USB cable and key ring attachment that you can use to put on your keys, a hook, or anywhere else you can think of.

It may not look like much to the average consumer, but it'll make a lovely gift for enthusiastic Apple Watch lovers.

Product Specifications

LED Indication
Compatible Apple Watches
Power Bank capacity: 700mAh
LED 1 flicker: 0-25% capacity
Apple Watch 1st Gen
Input: 5V/1A, micro USB port
LED 1 on, LED 2 flicker: 25-50% capacity
Apple Watch Series 1
Output: Apple Watch wireless charging (MCU)
LED 1-2 on, LED 3 flicker: 50-75% capacity
Apple Watch Series 2
Dimension: 53.06 x 39.9 x 18.2 (mm)
LED 1-3 on, LED 4 flicker: 75-99% capacity
Apple Watch Series 3
Weight: 51g
All LED's on: 100% capacity
Apple Watch Series 4

Top 4 Best Features

For such a minuscule package, it has a lot of advantages over similar products.

Here are some of my favorite features:

  • Key-ring Attachment
  • Compact Size
  • Built-in Magnetic Charging Module for Wireless Charging
  • Safety Certification

The last feature is extremely important as there have been numerous third-party chargers that have destroyed expensive Apple products in the past.

Key-ring Attachment

The key ring attachment is a nice touch to an already portable device, and it's excellent for travelers. Just simply attach it to your keys and you won't have to think twice about it.

But if you're not comfortable with attaching a pricey accessory to your keys, then why not clip it to your work station or inside your car. There are endless possibilities, and I'm sure you can find useful places to fasten the power bank to.

Compact Size

I really love how you can cleverly slip this portable power bank into your pocket, your purse or any tiny space for safe keeping.

To put the size into context, the Apple Watch Power Bank is smaller than a credit card and about as thick as a standard remote control. It feels smooth to the touch, has a fantastic durable design, and comes in a classic dark gray/black that will match almost anything.

Built-in Magnetic Charging Module for Wireless Charging

The MCU management allows this product to wirelessly charge every Apple Watch available (Gen 1 through Series 4) without the need of a bothersome cable.

You can comfortably wrap the watch around the power bank and see it spring into action. Just make sure it's turned on (hold the power button for 3 seconds) and double-check the battery indicators.

The wireless charging also works with the 38mm and 42mm models though the bank's compact size is more suited for the former.

Safety Certification

Besides being fully Apple MFi certified, it's also been subjected to the EU directive about RoHS & CE as well as the FCC to ensure high safety performance. Additionally the MCU management prevents things like overheating and short-circuiting while supplying proper voltage.

As I've mentioned before, the last thing any Apple consumer wants is to purchase a cheap charger, cable, or power bank that lacks these safety specifications. Speaking from experience, it's not worth saving a few bucks if the third-party item fries your very expensive gadget or phone.

I appreciate Oittm for ensuring all of their products meet these strict specs because too many companies ignore basic safety inspections.


Top 3 Worst Features

While there are few faults with this product, there are two significant things that I take issue with.

Here are the worst features of the Apple Watch Power Bank:

  • 700 mAh capacity
  • Long Power Bank Charge Time
  • 3 Hours to Charge a Watch

Understandably it's not a good thing if the worst features have to do with the power bank itself, but it's not as bad as it seems.

700 mAh Capacity

Most users probably won't care about this number, but in real terms, the 700 mAh rechargeable polymer battery can only deliver about 1.5 charges to your Apple Watch.

And that will vary depending on the Apple Watch series you're charging as extensive battery drainers will require more power.

I don't have a huge issue with the capacity (other products have less), but there is an obvious trade-off between portability and the supply capacity. The good news is that your watch should last for most of the day, and you may not even need those 1.5 charges.

Long Power Bank Charge Time

Another problem I had with this device was the long recharge times. It'll take about 3 hours to fully recharge your power bank, which could quickly make your key-chain attachment useless.

Honestly I was surprised that it took so long to fully restock a rather small battery, and it just emphasized the biggest problem with any power bank. Gadgets like these are only useful when they can charge your products, and it's easy to forget to refill your power supply.

My advice would be to set yourself a reminder to charge all products before you go to bed.

3 Hours to Charge a Watch

If it weren't bad enough that it took 3 hours to recharge the power bank, it'll take another 3 hours to fully charge your Apple Watch. Part of that has to do with the MCU safety management, but a lot of it comes down to the low capacity.

Again this isn't such a bad thing as long as you're responsible and know when to charge your devices, but it can get annoying if you're a heavy user or someone who doesn't want to constantly keep tabs on their gadget's battery.

That's why this product is not the best replacement for an Apple Watch charger, but then again, it wasn't supposed to be.

How It Compares to Other Apple Watch Power Banks

As far as battery capacity goes, the Oittm Power Bank Keychain is on the lower end of the scale.

There are chargers from Belkin and CHOETECH that offer far more capacity and work with the iPhone X and 8/8 Plus, but they're also more expensive, bulky, and were intended to function as standalone chargers.

In fact Oittm has their own portable charger that'll satisfy the big-time users who want more than just a mini-watch power bank, but again that depends on what the consumer's preference is.

So if you want something powerful that can do it all, then there are a lot of options to choose from but if you just want a sleek attachment that may come in handy from time to time, then there are few devices like this Power Bank Keychain.

3 stars for Oittm Apple Watch Power Bank

Final Review

Currently the 700mAh Apple Watch Power Bank is available on Amazon for $35-40, and it's frequently discounted throughout the year.

That's a fairly good deal compared to what's out there, but it does feel a bit pricey when juxtaposed with the dual chargers.

Still, I am happy to award this Apple Watch Keychain 3 out of 5 stars.

I loved the sturdy design, color scheme, compact size, key-ring attachment, and the safety specs. Those features were just enough to make up for the low battery capacity and the long charge/recharge times, but I wouldn't recommend it for power-users.

This has and was always meant to be an Apple Watch accessory, and if you view the item in that way, then the Oittm Apple Watch Power Bank Keychain will fulfill your needs perfectly.

Your Turn!

Would you try the Oittm Portable Apple Watch Power Bank?

See results

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.


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    • Chriswillman90 profile imageAUTHOR

      Krzysztof Willman 

      24 months ago from Parlin, New Jersey

      I agree, it's a great gift device and Apple consumers love their gadgets. I hope the next version makes the charging better too.

    • Chriswillman90 profile imageAUTHOR

      Krzysztof Willman 

      24 months ago from Parlin, New Jersey

      I try to be as balanced as I can, I hope some people will find it useful because it's a really good product.

    • aesta1 profile image

      Mary Norton 

      2 years ago from Ontario, Canada

      This would be a good gift for family members who have this watch. I like the sleek design but I hope they can make the charging faster.

    • FlourishAnyway profile image


      2 years ago from USA

      Good thorough honest review with both negative and positive features and a credible overall recommendation.


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