How to choose the right portable charger and power bank
Updated June 2026Independently researchedNo paid placement.
For most people, a mid‑range power bank between 10,000 and 20,000 mAh with USB‑C Power Delivery offers the best balance of capacity, portability, and charging speed. Look for reputable brands, at least one high‑wattage output port, and compatibility with your devices’ fast‑charging standards.
What size power bank do I actually need?
Start by checking your phone or tablet’s battery capacity. A typical smartphone holds around 3,000–5,000 mAh, while larger tablets and some laptops need 10,000 mAh or more per full charge. A power bank’s rated capacity is always higher than what you can actually extract because of voltage conversion losses, so a 10,000 mAh bank will usually deliver enough for about two full phone charges or one tablet charge. If you mainly need a daily top‑up or a backup for outings, a compact bank in the 5,000–10,000 mAh range is easy to carry. For multi‑day trips, charging multiple devices, or powering a small laptop, look at 20,000 mAh and above. Just remember that anything over 100 Wh – roughly 27,000 mAh at 3.7 V – may face airline restrictions, so check before you travel.
What should I look for in a portable charger?
Prioritize output ports and charging standards. USB‑C Power Delivery (USB‑PD) is the most universal fast‑charging protocol, working with modern iPhones, Android phones, Switch, and many laptops. Older Quick Charge 3.0 is still common for legacy Android devices. At least one high‑wattage port (18 W or more) ensures you aren’t stuck with slow trickle charging. Also consider pass‑through charging – being able to charge the bank and your device simultaneously – and trickle charge mode for low‑draw gear like earbuds or a fitness tracker. Safety certifications from UL, CE, or RoHS provide peace of mind, and reputable brands like Anker, Mophie, and RAVPower usually have better quality control and customer support.
Is it worth spending more on a premium power bank?
Higher‑priced models often use lithium‑polymer cells instead of the cheaper lithium‑ion pouch cells. Lithium‑polymer is slimmer, safer, and maintains its capacity longer over many cycles. Premium banks also tend to have better power delivery circuitry, meaning less lost energy and more consistent voltage – your phone charges at full speed without dropping out. On the other hand, a budget‑friendly power bank from a well‑known brand can still serve you well for a year or two. The trade‑off comes in longevity, build quality, and warranty. If you rely on your power bank daily or travel frequently, the extra cost for a premium model often pays off in reliability and safety.
Which power bank is best for travel and flying?
Airlines generally allow power banks up to 100 Wh without special approval. That works out to roughly 27,000 mAh at 3.7 V. Banks between 100 Wh and 160 Wh may be allowed with airline approval, but 160 Wh is the absolute limit. To save hassle, stick to 20,000 mAh or less – it will almost always breeze through security. For travel, consider a slim profile, built‑in cables (USB‑C and Lightning), and enough capacity to recharge both your phone and a tablet. Some people prefer a multi‑port bank that charges several gadgets at once, though that often means a larger brick. Look for one that has an easily visible LED indicator or LCD screen so you know exactly how much juice remains.
How do I choose between a slim stick and a larger brick?
Slim stick power banks (often around 5,000–10,000 mAh) fit easily in a pocket or clutch purse. They’re ideal for a quick top‑up on a night out or for keeping a phone alive through a long commute. The trade‑off is slower charging speeds – most sticks have a single 5 V USB‑A port – and limited total capacity. Larger brick‑style banks (15,000–30,000 mAh) typically support USB‑C Power Delivery at higher wattages, can charge a laptop, and have two or three output ports. They’re heavier and bulkier but offer true multi‑device power. If your bag can handle the extra weight and you need to get through a weekend without a wall outlet, a brick is the right choice.
What about wireless charging power banks?
A wireless power bank adds convenience: you can set your phone on top without fumbling with cables. They generally support Qi, meaning they work with any recent iPhone, Samsung Galaxy, or Google Pixel. However, wireless charging is less efficient than wired, so you’ll get fewer full charges from the same capacity. It also generates more heat, which can slow charging speeds. These banks are usually thicker and heavier than wired‑only models of the same capacity because they include a charging coil. They’re best for casual top‑ups, not high‑speed charging. Many modern wireless banks also include a USB‑C port for wired backup, so you can choose depending on the situation.
Frequently asked questions
Can I take a power bank on a plane?
Yes, but only in carry‑on luggage. Checked bags are not allowed to contain loose lithium‑ion batteries. The bank must be rated under 100 Wh (roughly 27,000 mAh) for unrestricted travel. Between 100 and 160 Wh requires airline approval, and over 160 Wh is prohibited.
How long does it take to charge a power bank itself?
Charging time depends on the bank’s input speed and the charger you plug it into. A 10,000 mAh bank with 18 W input can fill in about 3–4 hours. Larger 20,000 mAh banks with 45 W or 60 W input can charge in 2–3 hours if you use a compatible wall adapter. Budget models with microUSB input at 5 V/2 A can take 6–10 hours.
Is it safe to charge my phone overnight with a power bank?
Generally yes, provided the power bank has built‑in overcharge protection and trickle charging. Reputable brands include these safeguards. However, if you use a very low‑cost, uncertified bank, it may lack proper voltage regulation. For peace of mind, disconnect after your phone reaches 100% or use a bank from a trusted manufacturer.
What’s the difference between lithium‑ion and lithium‑polymer in power banks?
Lithium‑ion (Li‑ion) cells are cheaper, have a slightly higher energy density, and are found in most budget banks. Lithium‑polymer (Li‑Po) cells are slimmer, lighter, less prone to swelling, and usually last longer. For everyday use, both are fine, but Li‑Po is preferred for travel and premium products because of its safer form factor.
Why does my power bank lose charge even when I’m not using it?
All power banks self‑discharge over time – a typical rate is 2–5% per month. But if yours drains noticeably faster (e.g., 20% in a week), it might have a faulty circuit, or it could be an older model with lower‑quality cells. Storing a bank at around 50% charge and in a cool place minimizes self‑discharge.
Can I charge a laptop with a power bank?
Yes, if the power bank supports USB‑C Power Delivery at 45 W or higher and your laptop accepts USB‑C charging. Many ultrabooks and the latest MacBooks work well. For older laptops with a barrel connector, you’d need a special adapter or a purpose‑built laptop power bank. Always check your laptop’s required voltage and wattage before buying.