Replacement compatible battery for irobot roomba 4905 high capacity 3000mah replacement non-oem

I love my Roomba. Replacement battery from Tenergy worked great for a year. We were away from home for couple months and hubby unplugged charger. Returned to dead battery. Ordered new one--couldn't get it to work, even after following tips. Company quickly refunded payment. Ordered next replacement from another company. Charged up fine. Then we had a power failure and now newest battery won't work, even after changing order of battery hookup and holding down buttons. What is going on?

This is running my old Roomba like it used to. Powerful once again. Good price for since it was a non-OEM product!Yes, I will buy again!

This battery was used to replace a worn out OEM battery in our roomba 4100. We received it and charged it overnight. The next day it got to about 1 hour and 5 minutes before it died. It wasn't as long of a battery life as we were hoping for, from an extended life battery.It fit perfectly and only took, literally, seconds to replace the old battery with this one.

It got to us fastand in perfect condition. Appears to be factory new, with no markings to indicate it's been previously used.

A good deal for the money but I am somewhat dissapointed in the length of time it runs before battery has to be re-charged.

waiting to see if it lasts more than a year!

I have owned an i robot for at least 6 years maybe more. Every year i have to order a new battery. This year someone told me that i can now get batteries on line without going through Irobot. I am so grateful this battery was 1/3 the cost and works even better ( so far) runs longer by about 30 minutes. I love my irobot but was ready to just throw it away becasue of the continual costs. Thank you Amazon, i can now afford to keep it in batterys.

This is the second battery i have purchased from amazon (not roomba brand and from different seller) for my roomba.The prior one lasted WAY longer than this one from this seller.Not sure why this one was worse, but i bought back in october, 2012 and it started sowing bad performance in march, 2013.I am going back in order history and going to buy from prior seller again.