expired
Romoss 30000mAh 30W Fast Charging Portable Power Bank
$26
$46
43% off
+ Free Shippingat Amazon
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ROMOSS Direct via Amazon has Romoss 30000mAh 30W Fast Charging Portable Power Bank for $25.99 after clipping the $20 coupon on the product page. Shipping is free.
Note: Must be logged in to clip coupons; coupons are typically one-time use.
Thanks to Staff Member Bruinnn for posting this deal.
Features:
Note: Must be logged in to clip coupons; coupons are typically one-time use.
Thanks to Staff Member Bruinnn for posting this deal.
Features:
- QC30W & PD27W Rapid Charging
- 30000mAh High Capacity
- 3 Output Ports: 1xUSB-C Port and 2x USB-A ports
- 3 Input Ports: Micro USB, Lightning, Type-C ports
- Smart LED Indicator: Help you easy to track the battery power, current, and voltage.
- Fully recharge in less than 8 hours with an 18W wall charger(Not Included)
- What's included: 3000mAh Power Bank x 1, USB cable x 1. User manual x 1 & Free 12-month warranty.
Editor's Notes
Written by powerfuldoppler | Staff- About this product:
- Rating of 4.7 from over 3,600 Amazon customer reviews.
- About this store:
- ROMOSS Direct has a 4.8 score from over 2,600 ratings.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Additional note:
- Please see original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
ROMOSS Direct via Amazon has Romoss 30000mAh 30W Fast Charging Portable Power Bank for $25.99 after clipping the $20 coupon on the product page. Shipping is free.
Note: Must be logged in to clip coupons; coupons are typically one-time use.
Thanks to Staff Member Bruinnn for posting this deal.
Features:
Note: Must be logged in to clip coupons; coupons are typically one-time use.
Thanks to Staff Member Bruinnn for posting this deal.
Features:
- QC30W & PD27W Rapid Charging
- 30000mAh High Capacity
- 3 Output Ports: 1xUSB-C Port and 2x USB-A ports
- 3 Input Ports: Micro USB, Lightning, Type-C ports
- Smart LED Indicator: Help you easy to track the battery power, current, and voltage.
- Fully recharge in less than 8 hours with an 18W wall charger(Not Included)
- What's included: 3000mAh Power Bank x 1, USB cable x 1. User manual x 1 & Free 12-month warranty.
Editor's Notes
Written by powerfuldoppler | Staff- About this product:
- Rating of 4.7 from over 3,600 Amazon customer reviews.
- About this store:
- ROMOSS Direct has a 4.8 score from over 2,600 ratings.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Additional note:
- Please see original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.
Community Voting
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Top Comments
Ever notice how when charging both the phone and the battery pack gets warm? That's because the battery pack has to boost the internal voltage to 5v (often upwards of 90% efficient, but never 100%) and your phone has to take that 5v and step it back down to the phone's internal battery voltage, with similar losses. If your phone was quick charging, the efficiency drops even more, but it's hard to quantify since there's a lot of variance.
And then there's the power your phone uses that's never delivered to the internal battery. Your phone was still on when it was charging yeah? Well that power came from the battery pack, and when phones are plugged in they turn off most power saving measures. How much power does that take? Well who knows, you have no way of directly measuring it by just glancing at (wildly inaccurate) capacity gauges.
If you want to accurately measure how much power a power bank delivers without just wholly making shit up, you have to get something that actually measures how much power was delivered [amazon.com]. That doesn't account for the internal losses in the battery pack circuitry, but it'll get you in the ballpark. Ideally you'd charge the pack from empty through that, save the result, then charge a load from the battery until the battery is flat, and the battery capacity will be roughly halfway between the two results. It's more work than just plugging in your phone, but just plugging in your phone is only slightly better than just taking a wild ass guess.
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68 Comments
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Your interpretation is not correct. The TSA says packs up to 100Wh can be carried with no limit on the quantity, as long as they are for your personal use and not for resale. There is a hard limit of a maximum of 2 battery packs between 100Wh and 160Wh, but individual airlines have the option of not allowing such packs. Every airline I've checked explicitly states in their policies that up to two 160Wh packs are allowed on board.
I've also flown both domestically and internationally with a pack of this exact capacity, and it's never gotten so much as a glance.
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Sure, a naive approach would be to multiply out the percentages to get an approximate capacity of 19,166 mah. That fails to take into account a couple fairly significant factors, charging losses and power consumption of the phone itself.
Ever notice how when charging both the phone and the battery pack gets warm? That's because the battery pack has to boost the internal voltage to 5v (often upwards of 90% efficient, but never 100%) and your phone has to take that 5v and step it back down to the phone's internal battery voltage, with similar losses. If your phone was quick charging, the efficiency drops even more, but it's hard to quantify since there's a lot of variance.
And then there's the power your phone uses that's never delivered to the internal battery. Your phone was still on when it was charging yeah? Well that power came from the battery pack, and when phones are plugged in they turn off most power saving measures. How much power does that take? Well who knows, you have no way of directly measuring it by just glancing at (wildly inaccurate) capacity gauges.
If you want to accurately measure how much power a power bank delivers without just wholly making shit up, you have to get something that actually measures how much power was delivered [amazon.com]. That doesn't account for the internal losses in the battery pack circuitry, but it'll get you in the ballpark. Ideally you'd charge the pack from empty through that, save the result, then charge a load from the battery until the battery is flat, and the battery capacity will be roughly halfway between the two results. It's more work than just plugging in your phone, but just plugging in your phone is only slightly better than just taking a wild ass guess.
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That said, I'd really like to take a gamble, but the comments here and the negative reviews are telling me to sit on my hands, wait for something else.
Fake reviews on Amazon make me sad. It's deceptive, and it makes the entire system untrustworthy. Truly good products from small companies get lost in the noise, unless they go pay for fake reviews too.
That said, I'd really like to take a gamble, but the comments here and the negative reviews are telling me to sit on my hands, wait for something else.
Fake reviews on Amazon make me sad. It's deceptive, and it makes the entire system untrustworthy. Truly good products from small companies get lost in the noise, unless they go pay for fake reviews too.
The people here saying you can't take it on the plane and it's not 30,000mah don't know what they're talking about. ROMOSS battery packs aren't massively overspeced like some brands.
This is a great deal if you just need to charge small devices.
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