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RAVPower Pioneer Series 20000mAh 60W PD USB-C Power Bank w/ Quick Charge Expired
$33.70
$53.99
+ Free Shipping
Sunvalley Brands via Amazon has RAVPower Pioneer Series 20000mAh 60W PD Portable Charger USB-C Power Bank w/ Quick Charge for $33.71 when you 'clip' the $3 off coupon located on the product page and apply promotion code 20G925RV at checkout. Shipping is free. Thanks Bgunn925 & slow_hachiroku
Note, coupons are typically limited to one-time use per account.
Note, coupons are typically limited to one-time use per account.
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Original Post
Written by
Edited January 29, 2020
at 12:43 PM
I bought this yesterday for $53, then checked back today to see it had dropped by ~$8, plus an additional $3 off instant coupon.
https://www.amazon.com/Portable-R...7N9&sr=8-4
https://www.amazon.com/Portable-R...amp;sr=8-4
https://www.amazon.com/Portable-R...7N9&sr=8-4
https://www.amazon.com/Portable-R...amp;sr=8-4
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In 4 1, lowest I have seen for reputable 60w out/30w in power bank, thanks OP!!
1 Watt = 1 Amp x 1 Volt
1 Amp of current draw for 1 hour = 1Ah (amp hour)
1000 mAh (milliamp hours) = 1Ah (amp hour)
LiPo batteries are nominally 3.74V for capacity calculations (max charge is between 4.2V and 4.3V, but they will drift down to 3.3-3.4V before they must be recharged)
If you know Then multiply by To get
mAh 0.00374 Wh
Ah 3.74 Wh
Wh 267 mAh
Wh 0.267 Ah
Practically speaking, you should only use 80% of the battery rating to determine the amount of recharge you can get due to losses in charging and conversion, so this 20,000mAh battery will only result in 16,000mAh of charge into your laptop, or about 60Wh worth of real-world charging.
Edit: Sorry for the Code block; I'm not sure how to do tables. Also, LOL that sehlceris and I cross posted.
Multiply voltage (3.7 or 3.6, I don't know which, but it won't change the math by much) by aH (this bank has 20000 milliamp hours, so divide that by 1000 to get 20 aH)
3.6v * 20aH = 72Wh
However, you should multiply the Wh of this bank by 0.7 to account for power transfer inefficiency and also the possibility that ravpower is inflating their numbers a bit.
So 72Wh * 0.7 = 50.4 Wh.
I'd guess that you can charge half your laptop's battery. Your laptop battery is abnormally giant, by the way.
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This is one of the very few portable banks with high capacity (20k mah) and high wattage USB-C PD (60w). The Anker that hit FP yesterday was 20k mah but only 18w PD, which won't charge any laptop.
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Found on a website:
Multiply voltage (3.7 or 3.6, I don't know which, but it won't change the math by much) by aH (this bank has 20000 milliamp hours, so divide that by 1000 to get 20 aH)
3.6v * 20aH = 72Wh
However, you should multiply the Wh of this bank by 0.7 to account for power transfer inefficiency and also the possibility that ravpower is inflating their numbers a bit.
So 72Wh * 0.7 = 50.4 Wh.
I'd guess that you can charge half your laptop's battery. Your laptop battery is abnormally giant, by the way.
1 Watt = 1 Amp x 1 Volt
1 Amp of current draw for 1 hour = 1Ah (amp hour)
1000 mAh (milliamp hours) = 1Ah (amp hour)
LiPo batteries are nominally 3.74V for capacity calculations (max charge is between 4.2V and 4.3V, but they will drift down to 3.3-3.4V before they must be recharged)
Practically speaking, you should only use 80% of the battery rating to determine the amount of recharge you can get due to losses in charging and conversion, so this 20,000mAh battery will only result in 16,000mAh of charge into your laptop, or about 60Wh worth of real-world charging.
Edit: Sorry for the Code block; I'm not sure how to do tables. Also, LOL that sehlceris and I cross posted.
Yay electricity! Lol. For some reason I get a kick out of doing these calculations. Nice that we have an optimistic and pessimistic estimate now!
Multiply voltage (3.7 or 3.6, I don't know which, but it won't change the math by much) by aH (this bank has 20000 milliamp hours, so divide that by 1000 to get 20 aH)
3.6v * 20aH = 72Wh
However, you should multiply the Wh of this bank by 0.7 to account for power transfer inefficiency and also the possibility that ravpower is inflating their numbers a bit.
So 72Wh * 0.7 = 50.4 Wh.
I'd guess that you can charge half your laptop's battery. Your laptop battery is abnormally giant, by the way.
Thanks! My laptop is the old XPS 9560 with 97 WHr battery. Not really depleting the battery down to 0%, but your calculations make it a good gauge to anyone who has the same question I did. Thanks!
1 Watt = 1 Amp x 1 Volt
1 Amp of current draw for 1 hour = 1Ah (amp hour)
1000 mAh (milliamp hours) = 1Ah (amp hour)
LiPo batteries are nominally 3.74V for capacity calculations (max charge is between 4.2V and 4.3V, but they will drift down to 3.3-3.4V before they must be recharged)
Practically speaking, you should only use 80% of the battery rating to determine the amount of recharge you can get due to losses in charging and conversion, so this 20,000mAh battery will only result in 16,000mAh of charge into your laptop, or about 60Wh worth of real-world charging.
Edit: Sorry for the Code block; I'm not sure how to do tables. Also, LOL that sehlceris and I cross posted.
Thanks as well!