72Wh 61++ 01AV427 01AV425 Battery for Lenovo ThinkPad T480 T470 P51S P52S T570 T580 A485 A475 TP25 Series SB10K97584 SB10K97585 01AV490 01AV492 X50M08812 4X50M08812 01AV422 01AV423 01AV428

I used this to replace the original external battery (battery 2) on my Lenovo Thinkpad T480. The original interal battery was replaced about 6 months ago, and the external one still said the health was good at the time. However, it recently began a rapid decline and then would no longer hold a charge, at times preventing the laptop from charging the internal battery as a result. This arrived just over 70% charged, which is what they should be, and was immediately recognized and began charging after inserted. So far, so good, the performance is wha should be expected from an extended battery, and coupled with the internal battery I now have approximately 100Wh of battery to work with, more than enough to last all day without access to a charger. For the price, I consider it a great deal.

It fits the laptop (T580) pretty well, no problems there, but the capacity is not as described. It is around 57Wh not the claimed 72 Wh. At first I thought I got a bad/old/b-grade battery but there is another Amazon reviewer who got 2 of these with the same with the same issue withe the same diminished capacity. You might want to buy another brand.

The battery capacity is great on this external battery. It functions well and has held up nicely over the months I have owned. Continues to keep the charge and provide hours of computer usage. It is durable as I have had a few mishaps, but continued to work as designed.

I bought this again. The original battery was not holding a charge even after over night charge. This is so much better now!

Battery works and all but the max capacity is 52Wh and not 72Wh as advertised. I would return it fs but my original internal and external battery barely hold any charge nowadays so I’m gonna keep it and try to find the max capacity one later.

The quality is really badIt is not 72wh only 57

I bought this quickly and did not realize I bought the biggest battery with a larger physical footprint. With a new internal battery (separate purchase) and this new external battery the laptop lasts all day long... pretty awesome... but the larger battery size is worth considering. I have to remove the battery to fit in my laptop bag. That said, it's external and the laptop can function without it so it is a very effective external battery backup.

Was able to install battery although it was a bit tight since the casing is new. Fully charged and shows full capacity as listed. Let’s see how it fares after a month.