This battery was 3000mah 14.4V same as my old one. I was worried about getting something else after reading about these batteries. It might have been perfectly fine to use a 3500 or another but I really didn't know enough about it so just to be on the safe side I bought the same. I've also read reviews of various batteries and some people have said the ones they bought won't charge etc. I can't rate the battery life as I've only just got it. The old one came with my Roomba and lasted about 7 years (I don't know exactly how many hours). If this one lasts that long, it will be great. Very easy to install; there is absolutely no problem. Value for money: I could have gotten a cheaper one that might work, but its specs wouldn't quite match my old battery.
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