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Home/INIU/B-Series/INIU B42 18W 20000mAh Power Bank — Safe Fast Charge Portable Charger with PD 3.0 / QC 4.0+
-50%
B-Series
INIU B42 18W 20000mAh Power Bank — Safe Fast Charge Portable Charger with PD 3.0 / QC 4.0+
4.1 (8)
$69.00$34.50
The INIU B42 18W 20000mAh power bank delivers fast PD 3.0 / QC 4.0+ charging in a compact aviation-grade body for $34.50 (was $69.00) — buy online today and stack code SAVE15 for extra savings.
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15 people are viewing this item.21 sold today.Only 5 left in stock.
INIU B42 18W 20000mAh Power Bank — $34.50, 50% Off
The INIU B42 20000mAh power bank pairs 18W PD 3.0 and QC 4.0+ fast charging with the most compact 20000mAh build in its class — the safe pick for the 38-million-user INIU community. Buy online now at $34.50, down from $69.00.
How Long to Fully Charge the B42?
Recharging the B42's own 20000mAh battery takes roughly 6–7 hours with an 18W PD input charger. Output is faster: an iPhone 13 goes from 0 to 50% in about 25 minutes — nearly 1.5x faster than regular 2.4A chargers.
Is 18W Enough for an iPad?
Yes — 18W PD charges iPads at a solid rate, and 20000mAh capacity refills most tablets 2+ times.
How Many Galaxy S22 Ultra Charges?
The 20000mAh (74Wh) capacity delivers roughly 3.5–4 full charges for a Samsung Galaxy S22 Ultra's 5000mAh battery.
Specifications
Brand: INIU
Model: B42 / B-Series
Product Type: 20000mAh fast-charging power bank
Output: 18W PD 3.0 / QC 4.0+
Size: 5.3 x 2.7 x 1.0 in, 12.3 oz
Battery: Aviation-grade high energy density cells
Price Value & Deal Value
$34.50 versus $69.00 — a 50% discount on a trusted-name high-capacity bank. Code SAVE15 stacks extra 15% savings, and pairing with another item clears free shipping at $45.
Features
18W PD 3.0 / QC 4.0+ fast charging takes an iPhone 13 to 50% in 25 minutes
Most compact 20000mAh in its class — aviation-grade cells, 12.3 oz travel weight
$34.50 is 50% off the $69.00 compare-at price, with SAVE15 stacking more savings
Price: $34.50 (compare at $69.00)
Capacity: 20000mAh (74Wh)
Dimensions: 5.3 x 2.7 x 1.0 in, 12.3 oz
Max Output: 18W PD 3.0 / QC 4.0+
Product Type: 20000mAh portable power bank
Compatibility: iPhone 13/14/15, Samsung Galaxy, iPads, USB-C and USB-A devices
Model or Series: B42 / B-Series
Seller: Volt Harbor Supply
Product Details
Safe Fast Charge Pro, Deal-Priced
The B42 is INIU's trusted 20000mAh workhorse: compact enough for a jacket pocket, powerful enough for multi-day phone coverage. At $34.50 it undercuts comparable 20000mAh banks that sell for $45–$60.
Who Should Buy
Travelers, students, and anyone needing 3–4 phone charges or 2 tablet charges per trip without bulk.
Comparison
Versus basic 20000mAh banks, the B42 adds 18W PD/QC fast charging and aviation-grade cells — at a sale price with SAVE15 coupon savings and free shipping over $45.
Frequently Asked Questions
How long does it take to fully charge the INIU B42 20000mAh power bank?
Approximately 6–7 hours using an 18W PD input charger; standard lower-wattage inputs take longer.
Is 18W enough to charge an iPad with the B42?
Yes — 18W PD fast charging works well for iPads, and the 20000mAh capacity refills most tablets two or more times.
How many times can the B42 charge a Samsung Galaxy S22 Ultra?
Roughly 3.5–4 full charges from the 20000mAh / 74Wh capacity.
What's the current price and are there coupons or deals?
On sale for $34.50 (50% off $69.00). Use code SAVE15 for an extra 15% off and spend $45+ for free shipping.
4.1★★★★★★★★★★(8)
5 ★4
4 ★2
3 ★1
2 ★1
1 ★0
Customer Reviews
8
★★★★★★★★★★5.0
a**p
Verified
Reliable workhorse
I've owned this for eight months of daily use and it hasn't missed a beat. Charges my Pixel 7 about four times per full battery. The 18W PD input means the bank itself recharges quickly too. Can't beat it for the price.
★★★★★★★★★★5.0
s****b
Verified
Great backup power
Holds charge for weeks. Highly recommend.
★★★★★★★★★★4.0
s*****r
Verified
Good capacity, a bit slow to recharge itself
The 20,000mAh capacity is fantastic — easily a weekend's worth of phone power. Charging the bank back up takes a few hours with 18W, which is the only downside. Build feels sturdy and the safety features give me peace of mind.
★★★★★★★★★★3.0
e****x
Verified
Decent but heavier than expected
Does everything promised, but 20,000mAh in this form factor has some weight to it. Fine in a backpack, not great in a jacket pocket. Charging speed to my phone is solid with PD. If you want something truly pocketable, look at their smaller models.
★★★★★★★★★★5.0
e**d
Took it to a music festival, saved the weekend
Three days of camping, filming, and no outlets — this bank kept my phone and my friend's phone alive the whole time. Rained on it once, no issues. The matte finish doesn't show scuffs. Already recommended it to half my group chat.
★★★★★★★★★★5.0
d*x
Verified
Trustworthy brand, trustworthy product
I'm a retiree who has bought cheap power banks that died in months. This one feels different — solid, cool-running, and it shows exactly how much charge is left. My grandson set it up for me in two minutes. Very satisfied.
★★★★★★★★★★2.0
n****k
Verified
Stopped holding charge after 5 months
Started strong — four full phone charges, fast speeds. Around month five it began draining itself in the bag and now holds maybe half its original capacity. Maybe I got a bad unit; INIU's warranty process was straightforward, so I'm giving the replacement a chance.
★★★★★★★★★★4.0
i*u
Verified
Excellent value with the discount
Stacked the SAVE15 code and paid well under retail for a 20k bank with PD and QC support. Charges my Switch and phone simultaneously. Wish it came with a USB-C cable included, but the performance speaks for itself. No regrets.
