Thinkpad Battery 27++

• 57Y4545 is discontinued and replaced with 0a36304
• BATTERY 27++ , BATTERY 28++
• NOT A STAND ALONE BATTERY - WORKS WITH NORMAL LAPTOP BATTERY FOR EXTENDED RUN TIMES
• 9 CELL ADD-ON BATTERY THAT WORKS WITH THE SYSTEM BATTERY
• LENOVO FACTORY SEALED RETAIL BOX = SHIPPING 0A36304

I am using this additional battery on a Lenovo T420. It does what it is supposed to do. I am getting (roughly) about twice the battery life of my normal 9 cell. Like the previous poster, I could not get it to fit tight initially then all at once it snapped into place. Now I do not want to take it back off in case I have trouble getting it into position again. You may want to (very carefully!) play with it a bit if it does not snap into place initially. I have no idea what I did, but it seems snug and secure now. The extra power is great. I knocked off a star due to the somewhat squirrelly connection. Be aware that like any battery, this is going to add some weight and a bit more thickness to your laptop.

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Though this battery's capacity is very good, you need to be very careful when using it to avoid data loss. This battery always shuts off my T520 laptop unexpectedly. After the shut off, all the files that are not saved will be lost and windows will tell you your computer were not properly turned off when you restart.

With this battery attached, laptop will lost its power completely when your turn the laptop into sleeping mode, or unplug the AC power adapter. It will also shut off your computer when you try to attach the extended battery when the computer is running.

The technical support from Lenovo is very impatient and they refused a full refund. Very dissatisfied.

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This battery is listed as item: 0A36304 in its description. However the battery slice I received was part number 57Y4545. The difference is that battery part 57Y4545 will only work in pre 2012 Thinkpads due to changes in battery chemistry. (Read about this on the lenovo forums). If you have a newer thinkpad, do not buy this battery. The battery you want is this one: http://www.amazon.com/gp/product/B0085MPGZY/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

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Pros:

+ Cheaper than Lenovo's price (more than $50 difference)

+ Adds a solid 6-6.5 hours computing time

+ Elevation is nice when laptop is on desk

+ Fits firmly and no loose feeling on my Lenovo T410

+ Discharges first and is hot swappable

+ Is an authentic Lenovo battery

Cons:

Not really a con but adds quite a bit of weight. I've gotten

used to it.

Bottom Line:

If your laptop is compatible with this battery, get it. I love not having

to carry my charger with me when I leave the house with my laptop. I

am not a fan of how far batteries and electro-chemistry have progressed

in comparison with other technologies but go ahead and buy this battery.

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Mixed. Defnitely extends the battery life and does not create that much extra bulk. A little diffilcult to attach and several times computer has just died. Not sure if connection or what.