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DIY 18650 USB-C Power Bank Case (2×18650, 6000mAh)
I picked up this DIY 18650 USB Type-C Power Bank Case because I already had spare 18650 cells from some older electronics, and I wanted a customizable backup charger. The idea of building my own portable charger with USB-C output for under $4 felt too good to pass up.
Shipping took about two weeks to the U.S., which I consider fast for AliExpress. The case arrived well-packed in bubble wrap. Assembly was pretty straightforward — just pop in two 18650 batteries (not included) and close the shell. The USB-C input/output worked right away, and it also includes USB-A, so it’s versatile.
Pros:
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Super affordable for what you get
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USB-C input and output
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Lightweight and pocket-friendly
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Easy to assemble if you’re even mildly handy
Cons:
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No instructions included
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Doesn’t support fast charging
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The battery indicator LEDs are a bit dim
In the U.S., a 6000mAh power bank with similar features goes for $15–25. This was under $4 — even after adding the cost of batteries, it’s still cheaper. It absolutely met my expectations for a basic, DIY solution. I even ordered a second one after testing the first.
US $3.6
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CR2032 Coin Cell Battery Bulk Pack (60PCS)
This bulk pack of CR2032 button batteries caught my eye because I have multiple remotes, digital thermometers, and a bathroom scale that use these. A 60-pack for the price of 4 name-brand cells in the U.S.? I had to try it.
They arrived in a simple blister pack, all neatly aligned. I tested five randomly in different devices — all worked perfectly. Voltage measured a solid 3.0V right out of the package.
Pros:
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Insanely affordable
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Perfect for households with lots of small electronics
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All 60 tested good voltage
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Long shelf life (2029 expiry on mine)
Cons:
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No brand name, so possibly variable longevity
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Basic packaging
In the U.S., CR2032s go for around $1 each — this whole pack cost less than $7. So far, these are performing exactly like Duracells or Energizers. Definitely exceeded expectations.
US $3.57
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4×18650 DIY Power Bank Case (Dual USB + Micro-USB + Type-C)
I bought the 4-cell 18650 power bank case because I wanted something beefier than the 2-cell version. With four batteries, I expected longer charge life and more output options — and this delivers.
Assembly was quick, though a bit tighter fit than expected. The LCD shows percentage and charging status, which is a bonus. It supports micro-USB, USB-C, and dual USB-A outputs — very handy for charging multiple devices.
Pros:
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Multi-port output
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Supports four batteries for high capacity
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Clear digital display
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Tough plastic build
Cons:
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Slightly bulky
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No quick charge support
At under $7, this rivals $30+ U.S. power banks in both capacity and functionality (minus fast charge). It’s now my go-to travel charger. Totally worth the price and then some.
US $1.19
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Panasonic CR2032 (5pcs)
I got the Panasonic CR2032s mostly for mission-critical items like my car key fob and digital thermometer. I wanted the real deal — and yes, they are authentic.
Shipping was surprisingly fast (around 10 days). The five-pack came in original Panasonic packaging, with a 10-year shelf life. Performance is top-tier — devices instantly recognized the battery, and I trust these more than generics.
Pros:
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Authentic Panasonic
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Reliable voltage and long life
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Great for sensitive electronics
Cons:
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More expensive per unit than bulk generics
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Limited to 5 pcs
At around $0.60 each, these are cheaper than most U.S. stores (where you’d pay $2–$3 per battery). Solid buy for key electronics where you can’t afford battery failure.
US $4.56
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LR44 AG13 Button Batteries (100PCS)
I ordered this 100-pack of LR44 button batteries for my kids’ toys and a few small kitchen scales. The price was too tempting — about $6 for 100!
They came in two large plastic trays, well-packaged. I tested around 15 in various toys, and all worked great. Voltage hovered around 1.52V. No leakage or weird smells.
Pros:
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Incredible value
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Decent voltage on all tested units
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Works well in low-drain devices
Cons:
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Unknown brand
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May not last as long in high-drain gadgets
In U.S. stores, even off-brand LR44s cost $0.30–$0.50 each. This whole pack cost less than a Big Mac. Great for quantity-over-quality needs.
US $1.19
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USB Rechargeable AA/AAA Batteries (MATOV)
I was skeptical about USB rechargeable AA and AAA lithium batteries, but decided to try them for game controllers, TV remotes, and wireless mice. They come with a built-in USB port — no external charger needed.
The set arrived in a neat case, fully charged. Charging via USB is super convenient. Each AA outputs a steady 1.5V, unlike NiMH batteries that drop to 1.2V. That means better performance in sensitive electronics.
Pros:
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USB charging is genius
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Steady 1.5V output
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Long-lasting between charges
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Compact case included
Cons:
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Pricey upfront
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Not ideal for high-drain devices like flashes
These cost ~$15 for 4 AA and 4 AAA. In the U.S., similar batteries go for $25–$30. These worked beautifully in my Xbox controller and wireless keyboard. Highly impressed.
US $4.2
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Bulk CR2032 Batteries (100PCS)
This 100-pack of CR2032s was a gamble for me. I needed a stash for work (I fix remotes and small devices), so I wanted something cost-efficient.
They came in a big plastic tray, labeled “KCR2032.” Voltage was mostly consistent at 2.95–3.0V. I tested a dozen, and all worked. They seem just as good as the 60-pack version but more cost-effective per unit.
Pros:
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Dirt cheap
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Great for technicians or resellers
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Decent voltage across the batch
Cons:
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Some slight voltage variance
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Unbranded
At under $10 for 100, it’s unbeatable. In retail stores, this would cost $100+. Not bad for everyday use — just don’t expect the lifespan of a Panasonic.
US $3.65
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DIY 18650 Power Bank (USB-C + LED Display, Sleek Build)
This sleek 2×18650 USB-C power bank case with LED screen looked more premium than most DIY kits, and I was curious how it would compare.
It’s compact, has a nice finish, and the LED display shows real-time charge. USB-C works well, though not PD fast charging. Assembly was easy. After inserting two Panasonic cells, I got about 5200mAh effective output.
Pros:
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Clean look, premium design
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Real-time LED display
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USB-C and USB-A ports
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Fits in pocket easily
Cons:
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No fast charge
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Slightly pricier than basic DIY cases
Still, it’s under $6. In the U.S., similar power banks with LED readouts cost $25+. Very happy with this one — looks and performs better than expected.
US $1.19
Final Thoughts
Honestly, I went into this AliExpress haul expecting “meh” quality and long shipping. But I’ve been pleasantly surprised. Most products arrived within two to three weeks, and all of them work well — especially the power bank cases and the USB rechargeable batteries.
I’d recommend every single one of these items — just make sure you know what you’re getting (e.g., that DIY kits require batteries). Compared to U.S. prices, I saved a ton. I’ll definitely be ordering more, especially now that I know which sellers are reliable.
