BULL-TECH SL410 Laptop Battery Compatible with ThinkPad E40 E50 L410 L420 L510 L520 L412 SL510 T410 T510 T520 W510 ; ThinkPad Edge 14 15 E420 E425 E520 E525 ; fits P/N 42T4791 FRU 42T4751 55+

I've been using the battery in my Lenovo T410 since it arrived early November. It is working flawlessly as my original battery was down to a 30% recharge at best resulting in keeping the laptop near enough to a power outlet to plug it in. With the new Bull-Tech battery I can run the laptop on battery for hours. I've waited to review to ensure an opportunity to put the battery through a few charging cycles. It fits the laptop perfectly. I also have a Lenovo W510 and when its battery needs to be replaced I would definitely consider another purchase from Bull-Tech.

The battery was exactly as described. It works perfectly with my mom's laptop. It seems to be holding a charge with no issues. So far, we have no complaints. Also, shipping was really quick.

Fantastic! Arrived well packaged and ready to go. Added to laptop, and charged over night. Been using it with outstanding battery life. Nice to be mobile again. Thank you Power Windows!This is an update. Seller stated: Dear Jeff, Thanks for your time. I want to send you a mobile power supply (power bank) to thank you for your recent order.To date and after reaching out, I've heard nothing but crickets. In addition, this battery doesn't even make it 30 minutes now.

When I first installed the bull-tech SL410 replacement battery, it would only charge up to 58% and then I let it fully discharge and it charged to 100% and has been working fine. The battery life on my Think Pad WS510 with this replacement battery is about 2 hours which is not as good as the original battery, but I was expecting it would be less. I think it is a great value for the price and I can't judge the longevity as I've only had it a month, but it is working well.

I ordered this for a replacement battery on a customers Lenovo. Fit perfectly and worked great right out of the box! Took a charge immediately and let my customer get back the battery time he had when the laptop was brand new. Best $30 you will spend to keep your laptop running!

I bought this on Nov. 6 2017 and it totally failed yesterday so I got less than nine months service out of it in my Lenovo E525. Supposedly it has an eighteen month warranty period, I can't wait to see what I have to do to receive a new one under warranty, ship it back to China??edit - also the one I received does not look like the one in the image of the product. Mine does not say "Bull-tech" on it, mine says "LQM" and is totally black, no yellow, just totally black. It does say 10.8V and 5200mAH so it supposedly has the same capacity as the "Bull-tech" that is advertised. But when I buy something on Amazon I expect to receive EXACTLY what is pictured in the description.Buyer beware.Update - the seller sent me a new battery and it is like the one pictured. So I have given them four stars..

I had gone far too long with my old battery, getting 30 minutes out of it, if I was lucky. I held off replacing it, because I thought it would cost too much. I was really surprised to find this one so cheap. Now, I get 4 hours use on one charge! What a difference! Good service, too.

This battery did not last very long at all. Within 6 months it wouldn't hold a charge very long.