No one wants a dead phone, but for less than $25 you can make sure that doesn't happen again.

Cell phone batteries don't always last as long as our days do, and no one wants to be carrying around a dead phone or be tied to the wall to charge it up, right? Well, luckily you can charge your phone while you walk around, sit on the subway, have drinks with friends, or anywhere else you may be with ease. Portable batteries are a must-have these days since most phones have non-removable batteries, and they don't have to cost a fortune.

There are a bunch of great portable batteries out there, and here are some affordable ones to consider for less than $25.

Aukey mini 5000mAh

Your first thought about a portable battery is that you don't have the space to carry it around all day and don't want something big and bulky in your bag. Well, Aukey's 5000mAh power bank offers a nice small cylinder design that is shorter than a can of soda. You should be able to get up to two full charges out of the battery pack, so you can keep yourself powered up wherever you may be.

It has a single USB-A output, so you can bring your own charging cable, be it Micro-USB, USB-C, or even Lightning. You charge the battery itself with a Micro-USB cable, and it has built-in safeguards to protect against excessive currents, overheating, and overcharging. At $10, there is really no reason for everyone in your family not to have one of these.

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Kmashi 15000mAh

Depending on your usage habits or how many devices you are carrying around with you, you may need to have a large battery with you to be safe. Kmashi's 15000mAh portable battery should offer anywhere from three to five full charges, depending whether it is a phone or table that you are charging up. It has two USB outputs, so you can add the cable of your choice to charge what is in your hand.

The built-in LED lights will let you know how much power is left in the battery so you don't take a dead battery pack with you the following day. At under $15, this is the perfect option for anyone using more than one device during the day.

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Jackery 12000mAh

Looking for a happy medium between being small and having plenty of power to meet your needs? Jackery's 12000mAh portable battery is only just over 4 inches tall and 3 inches wide, so you should be able to easily keep this in your bag, jacket pocket, glove compartment or anywhere else you may find it useful. You'll have two USB outputs for charging your phone, tablet, action camera, or other electronics, and it charges through a Micro-USB port.

If you find yourself without power, or no flashlight around, the battery pack has a dual-LED flashlight built-in, so you can make sure you see where you are trying to go. Coming in at just over $20, it is a bit more expensive than some of the other options at this capacity, but the convenience of its size makes up for that.

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RAVPower 13400mAh

Some electronics need a higher output in order to avoid charging at a snail pace, and the RAVPower portable battery offers the highest output in the market. With 4.5A of output, the RAVPower 13400mAh power pack can charge two of your devices at the same time with ease. It utilizes exclusive iSmart technology which can automatically detect and deliver the optimal charging current for the device attached.

It has four LEDs to easily show you how much power remains in it, and thanks to its capacity you should be able to charge anywhere from three to five times depending on your device. Priced at just under $25, this is quite a value if you want a quicker charge while walking around.

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Anker Astro 5200mAh

If small is what you are looking for, Anker's Astro 5200mAh is a great option to look at. While only marginally larger in capacity than some of the others in this size, it offers exclusive PowerIQ technology to detect the best charging for your phone or tablet and then offer that output (up to 2A). This means that it will charge your device as quick as it can, but it doesn't support Qualcomm Quick Charge.

It is available in white, black, and red, so you can pick which one may be most visually appealing, or have one of each laying around to match your outfit. Coming in at just over $15, this is a great option to have around for yourself as well as grabbing a few for loved ones.

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Your favorite?

Do you have a favorite portable battery pack under $25 that isn't listed here? Be sure to drop a line in the comments with a link to the battery and why you like it so much!