Anker · Budget
The Anker 313 Power Bank (PowerCore 10K, model A1229) is a 10,000 mAh portable charger with one USB-A port and one USB-C port, plus a Micro-USB port.
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We have not tested it ourselves: strengths and weaknesses below come from the tests cited.
A railfan's phone doubles as camera, map, timetable app and train tracker, and a long day at one location can drain it. Anker's own figures for this model are 2.25 charges for an iPhone 12, 1.6 for a Galaxy S20 and 1.2 for an iPad mini 5, so a single pack refills a phone of that size more than twice during a day at a viewpoint or on a station platform. Anker also describes the unit as slim and light for its capacity, which matters when a charger rides in a camera bag or a jacket pocket.
The unit has a power button and an LED indicator. Anker says its PowerIQ and VoltageBoost technologies deliver a charge of up to 2.4 A and do not support Qualcomm Quick Charge, so do not expect Quick Charge speeds. A trickle-charging mode, started by pressing the power button twice or holding it for 2 seconds until the LED turns green, is meant for low-power devices such as earphones and Bluetooth speakers. The page lists up to 15W of output on the USB-C port. Plan the cabling before you leave home: the page says the USB-C cable, the Lightning cable and an AC adapter are not included.
Strengths
Weaknesses
| Specification | Value |
|---|---|
| Color | Black (also listed in white) |
| Ports | 1 USB-C, 1 USB-A, 1 Micro-USB |
| Capacity | 10,000 mAh |
| Protection | Surge protection and short circuit prevention |
| USB-C output | 15W max |
| Charging technology | PowerIQ and VoltageBoost, up to 2.4 A |
Someone who wants a simple, no-frills charger for a phone, earphones or a Bluetooth speaker and does not need fast charging. It suits a first-time buyer who will bring their own USB-C or Lightning cable. It is not the right choice for anyone who wants Quick Charge speeds, and Anker says the two input ports may not be used at the same time.
Anker also lists a Nano Power Bank (10K) on the same page; check its listing for ports and cable details before choosing between the two.
Image: Anker · source
Anker · Mid-range
A 10,000 mAh power bank with a 45 W USB-C output and a retractable USB-C cable built into the body, so a phone can be charged without carrying a separate lead.
Expert pick · TechRadar, Oct 2025
Image: Elecom · source
Elecom · Mid-range
A rounded, cushioned 15,000mAh power bank from Elecom’s NESTOUT outdoor line, built to IP67-equivalent dust and water protection and drop-tested for days spent outside.
Energizer · Premium
Energizer Ultimate Lithium AA (model L91) is a 1.5V lithium AA cell that Energizer specifies for use from -40°F to 140°F and for up to 25 years in storage, offered here as an eight-battery pack.
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