AnkerLaptop Power Bank, 25,000mAh Portable Charger with Triple 100W USB-C Ports for Multi-Device Charging, Built-in and Retractable Cables, for iPhone 16/15 Series, MacBook, Samsung, and More

I was about to return it. It seemed like it didn't last as long as it should when plugged into my laptop. I decided to get scientific about it and record stats, then let the ChatGPT do the calculation grunt work. Bottom line - this battery pack is in line with the stated specifications. I like the built-in cords too.-- My observations (prompt for ChatGPT) --I have an laptop with a 80wh battery which is discharged to 2%I have a 90wh external battery that I am using to recharge itAt 1:06, the external battery is reporting 100%At 1:23, 80%at 1:48, 49%at 2:19, 5%[I used a separate PD 3.1 240w rated cord to plug the power bank into the laptop - not the built-in cords. This in bracket was not part of the prompt]--- ChatGPT response beginLet's break down what happened:The Setup:• Your laptop battery is rated at 80 Wh and was nearly empty (around 2%).• You used a 90 Wh external battery to charge the laptop.The Reported Readings:• At 1:06, the external battery showed 100% (full capacity, which is 90 Wh).• At 1:23, it dropped to 80%—a 20% reduction, which translates roughly to 18 Wh (20% of 90 Wh).• At 1:48, it read 49%—a further drop of 31% or about 28 Wh (31% of 90 Wh).• By 2:19, it was down to 5%—a drop of 44%, approximately 40 Wh (44% of 90 Wh).Energy Delivered:Adding those drops together:• 18 Wh + 28 Wh + 40 Wh ≈ 86 WhThis total is close to the rated 90 Wh of the external battery. It suggests that nearly the full capacity was used, with any small discrepancies likely due to rounding, measurement uncertainty, and minor conversion inefficiencies.Considering the Laptop Battery:An 80 Wh battery starting from about 2% will need roughly 78–80 Wh to reach full charge, assuming 100% efficiency. In practice, charging systems have losses (typically around 5–10%), so the energy drawn from the external battery might be a bit higher than what actually gets stored in the laptop battery. In your case, the external battery delivered around 86 Wh, which is reasonable when you account for these losses.Conclusion:The external battery’s behavior—discharging nearly its full 90 Wh capacity over the course of the charging session—is consistent with its rating. In other words, given the slight inefficiencies inherent in voltage conversion and charging circuitry, the numbers you observed are within the expected range. This means the battery is performing as rated.So yes, based on the energy calculations and typical system losses, your external battery appears to be performing in line with its 90 Wh rating.--- ChatGPT response end

During a recent 3-day power outage, my 7 year old Anker 25K mAh power bank kept our phones and ipads alive - if we were careful with their use. On the second day I started thinking it would have been nice to have a second one, just in case, and I had been eyeing these on Amazon for some time. Most of our devices are USB-C now so the 2 built in connectors wiil just plug in, and a 4-pack of Thunderbird adapters is cheap enough to just put one in each travel bag - in case we forget to take one of the many USB-A/Thunderbird cables we already have.So I bought this one as soon as we could get back online. This is a VERY nice upgrade of the older model. It seems to recharge a lot faster, and clearly charges the Apple M1 tablet and computer MUCH better than the old one which was basically made for phones of the day. So while the capacity may be the same as before (thanks TSA) the functionality is much greater for today's technology. The built in cables are convenient, and the various readouts are comforting if not absolutely necessary. But as I can't seem to stop getting older, I'm finding that comfort, in the form of additional information like this device provides, is worth paying for.It's a bit heavier than the older model, but probably about the same size if you measure volume. Its square shape will make it harder to fit into my carry-on computer bag than the older, flatter model, but I wouldn't give up its improvements for the flatter shape. I'll find a computer bag that works better if it comes to that.Overall, I'm very pleased with the product. If it lasts and performs as reliably as the older one it will be a more than worthwhile purchase.

I originally bought a generic battery and then wound up returning it. I needed a battery to ensure that a smart telescope wouldn't run out during the course of an evening. The generic battery was causing all kinds of interference when it was near the telescope. Moved away from the telescope and that issue went away but the new issue is that both the battery and the telescope were draining. So I splurged on the Anker battery. And it's a real treat after the generic. Love the display information. And the labeling on the actual ports also lets you know some of them are incoming power to charge the battery and some are outgoing. Was well with the extra money. So far I've run the smart telescope the past 2 evenings for about 6 hours in temperatures that have dropped over the course of the evening down to the mid 40F range. The battery has gotten down to 43% each night and the telescope itself is still at 100%.

This is the largest power bank that can be taken on a plane and is okay with TSA. That being said I bought this as it's so multi functional. My wife took it on a DC trip and it lasted her 8 days with charging camera batteries and her phone. Now she did charge her phone at night with her Samsung pad charger but this was used during the day to keep things going. It ran out of juice on the flight back after eight days. It is slightly heavy as it's 25k Mah. This thing is very handy in power down situations or on the go with kids and parents phones to keep charged. The carry strap is no joke. It's very strong and the extendable cord feels like it's high quality as well. This will also power our Dell XPS 13 Laptop. So for an all in one charger for personal devices and a laptop it checks all of the boxes. I am in the IT field and and brought it into work to show it off with my colleagues. Everyone was impressed and these guys/gals aren't easily impressed. If you were looking for a suggestion. I highly recommend it.