RAVPower® Xtreme 23000mAh 3-Port Portable External Battery Charger with Multi-Voltage (9V/12V/16V/19V/20V - LCD Display) for UltraBook, Digital Cameras, Camcorder,Surface Tablets,Asus Tablets,Acer Tablets,HP, Dell, Acer, Asus, Toshiba Netbooks Laptops,iPh

Just received this battery, chosen because I wanted a battery that could charge my laptop, phone and vaporizer on long distance bike rides. Have only used it once but was able to fully charge a Lenovo Yoga (20V/3.25amp), Samsung Galaxy (5V/2amp) and Solo Arizer (12V/1amp) with enough juice left over to for another half charge of the Galaxy or Solo. More than enough power a couple of days off the grid/on a bike/camping, happy with purchase. Apparently the battery can also be charged with a solar panel with dc output, though I haven't tried myself but will probably do so in the future. Will update to 5 stars if this battery is still functioning well a year from now.

This was keeping my cell and my chromebook charged with ease. Even at negative 14C it was working just fine. I had an area I could charge it at every 3 or 4 days and the rest of the time I ran my stuff of it. It would charge my Lenovo Chromebook 3 times and my Galaxy S5 10 times.I am very impressed with this thing. I've dropped it SOOO many times and it still works just fine. I had it in the inside pocket of my jacket and my friend punched me in the chest I barely felt a thing his hand crazy hurt AND it didn't stop charging my phone. This thing is clearly from space.

Works great, awesome customer support as well. I bring this on long plane rides, and I use it to charge my surface book (personal machine), thinkpad X1 carbon (work machine) and nintendo switch, depending on what I'm using on the plane. Does the job for all three! Plenty of power even to get through the long flights from coast to coast. Although it's a little frustrating that you need to bring a separate wall-wart adapter to recharge this (it does not re-charge through USB or other standard plugs), the benefit is that it charges extremely quickly, a few hours to full.On top of that, customer support is excellent. I accidentally left the AC adapter to charge this battery at an airport. I wrote to customer support to see if I could buy a new adapter as a standalone part, and to my surprise they mailed me a replacement for free! A++ support.

One of the few chargers that supports charging laptops. It works well, is intuitive to use, but battery capacity isn't accurate. I haven't tried opening and measuring battery capacity with a hobby charger yet (most definitely uses 18650 cells), but either due to poorer quality cells, or inefficient power conversion, you don't actually get 23Ah worth of power out of it. That's fine I suppose - this was somewhat expected. My real gripe is with battery level meter. It will sometime be around the 20-25% range, and suddenly go to 0% when I plug in a 2nd phone, or die from 20% to 0 with a single phone. This make estimating remaining time to use my phone very difficult.It's one thing to have just 'ok' cells or circuit, but having the meter be unpredictable is a big issue. Considering I paid 2x the price for this pack vs similar capacity power banks (without laptop charging though), I'd expect a little better.

So far so good, have yet to venture off into the wild with it but with the variable power output from the 9v-20v Multi-Voltage port and the beefy 23,000mAh batteries I can charge virtually anything I feel like bringing into the wilderness with me.. Thus far it charges with every usb device i chucked at it. 12volt battery chargers for AAA-D cells, Can get several charges into my 2700mah- 5100mah quad-copter lipo's, to allow some awesome backwoods video. Radio's and 12 volt led lightsGranted there is virtually nothing this thing will not charge up it is a portable charger and like a solar panel it is not designed to "Run" devices off with its maximum amperage of 4.5. That being said. it can still power quite a few gadgets and maybe even a small 50-75 watt dc inverter. just make sure you check the requirements.Speaking of solar panels this puppy is chargeable via a 20+ watt 18 volt solar panel to have a complete offgrid or base-camp setup. Just picked up a  ALLPOWERS 18V 28W Foldable Solar Laptop Charger(5V USB with iSolar Technology+18V DC Output) Portable Backup Charger for Laptop below 18V2A, cell Phone, Tablet, ipad, ipod, iphone, Samsung, Blackberry and Other Digital Products With this combo it is essentially a $545. Goal Zero SHERPA 50 SOLAR KIT but with a 4 and a half times bigger battery. "Rav 23,000 vs sherpa 5,200 mah", and 15 more watts on the solar panel. "28 watt allpower vs 13 watt nomad13" only $305 cheaper.. total cost $240 ALLPOWERS 18V 28W Foldable Solar Laptop Charger(5V USB with iSolar Technology+18V DC Output) Portable Backup Charger for Laptop below 18V2A, cell Phone, Tablet, ipad, ipod, iphone, Samsung, Blackberry and Other Digital Products