We're a virtual company made up of tech experts from across the globe. We live and breathe Android phones, and we understand how frustrating it can be when they die. That's why we've sought out the best battery packs you can buy.
The ZeroLemon Slim Power is the best case to prolong the life of your Galaxy Note 9. With a 5000mAh extended battery, you can nearly double the life of the phone, and ZeroLemon is a trusted brand that provides lifetime support in addition to the case's one-year warranty.
Our pick
ZeroLemon Slim Power
A huge battery case from a trusted brand.
The Slim Power provides the Note 9 with an additional 5000mAh battery pack, and features a "chinless" design that keeps the height of the phone to a minimum. Just like the Note 9 itself, it charges over USB-C and even supports passthrough charging.
Who should buy this battery case
The Galaxy Note 9 already has fantastic battery life, but sometimes things happen. Maybe you're going on a weekend camping trip without power, or maybe you just forgot to charge your phone overnight and have to rush out to work. Whatever the reason, a battery case is always handy to have. It adds significant thickness to the already huge Note 9, but that's better than having a dead phone in your pocket.
Is it a good time to buy this phone?
Yes. Just like the Note 9 itself, the ZeroLemon Slim Power is a brand new product that won't be getting replaced with a newer model any time soon.
Reasons to buy
- More than doubles the phone's battery capacity
- Easily affordable
- Supports passthrough charging
Reasons not to buy
- Makes the phone very thick
- Negates wireless charging and mobile payments
Don't let your Note 9 die
ZeroLemon has been a trusted brand for battery-related accessories for years, which is what you want when you're shopping for something to go with your $1,000 superphone. That doesn't mean it has to be expensive like the phone, though — at just $35, it's hard to argue with the Slim Power case, even if you only buy it to have around as a backup and don't use it every day.
Don't settle for no-name brands when you're buying accessories for your $1,000 phone.
Don't let the name Slim Power confuse you, though — while it's relatively small for a 5000mAh battery, this case will make your Note 9 anything but slim. On the bright side, it's cleverly designed to keep from adding any more height to the phone, aside from the small bump where the case plugs into the Note 9's USB-C port.
The Slim Power case also supports pass-through charging, which means you don't have to take your phone out of the case to charge it directly; instead, plugging a USB-C cable into the Slim Power will prioritize your Note 9 first, charging the case once the phone has reached full battery.
Alternatives to the Slim Power
ZeroLemon may be the most recognizable name of the bunch, but it isn't the only name. Moonmini offers an identical case for slightly cheaper, and i-BLADES has a much slimmer, unique modular design that, while significantly more expensive, could be worth a look if you don't need a huge additional battery.
Runner-up
Moonmini Battery Case
Identical to the ZeroLemon in every way.
Moonmini isn't as well-known as ZeroLemon, but its battery case offers the same 5000mAh cell for $5 cheaper. In fact, it looks like an identical model, though you won't get the same lifelong support after your one-year warranty expires.
We'd still recommend sticking with a well-established name like ZeroLemon, if nothing else for the longterm support, but if you're looking to save every dollar possible, Moonmini seems to offer the exact same case at a $5 discount.
Modular pick
i-BLADES Smartcase
Slim, modular design with its own built-in storage.
The i-BLADES Smartcase is the most flexible case of the bunch. It's a thin polycarbonate case that uses magnets to attach a separate 1800mAh battery pack. In addition, the case houses additional storage for your phone, along with an extra microSD slot.
With a much smaller 1800mAh battery compared to the alternatives' 5000mAh cells, it's hard to recommend the i-BLADES case for a whopping $100. When you're not using the battery, though, it's an extremely thin case, and even features additional storage and a microSD card slot to augment your Note 9.
Bottom line
If you need to extend the battery life on your Galaxy Note 9, the ZeroLemon Slim Power is easily your best bet. If you don't mind questionable aftermarket support, however, Moonmini's case is identical for a few bucks cheaper, and the i-BLADES Smartcase is an interesting option in its own right.
Credits — The team that worked on this guide
Hayato Huseman is a recovering trade show addict and associate editor for Android Central based out of Indianapolis. He can mostly be found complaining about the cold and enthusing about prog metal on Twitter at @hayatohuseman. Got a tip or inquiry? Drop him a line at hayato@mobilenations.com.
Daniel Bader is the Managing Editor of Android Central. As he's writing this, a mountain of old Android phones is about to fall on his head, but his Great Dane will protect him. He drinks way too much coffee and sleeps too little. He wonders if there's a correlation.
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