COMBO: 2 Pcs Tenergy Replacement Batteries (Yellow Case) for iRobot Roomba APS 4905 400 series Vacumm Cleaner

I've read a number of reviews which were critical of the "limited" life span of the Tenergy batteries. I own 4 Roombas. I run them daily -- sometimes 2-3 times. With that kind of use, I would be pleased if the batteries lasted 6 months. But, the Tenergy batteries which I have used over the last 6 years have consistently lasted 12 - 18 months. Maybe I'm just lucky and always get the "good" batteries. I doubt it. I've purchased 12 of these over the past 6 years and am completely satisfied.....especially given the price.

First off, this are re-manufactured batteries; both came with scratches on the cases. Not a real issue, assuming that they are OK. Unfortunately, they are not; after less than 3 months, this batteries managed to damage the charging circuit on both Roombas Discovery I was using them on. Apparently, the charging current required by this batteries is higher than what Roomba is designed for and it will overheat some components from the internal charger that will eventually fail. Never had a problem with original batteries; one is still working on the third Roomba I have. If you want to stay out of trouble, look for a genuine Roomba battery. A little more expensive but it will save you money not having to fix the Roomba.

Batteries work great, I had put off buying one from Roomba cause they wanted too much money for one battery, here I was able to purchase two for a much better price. My Roomba sat for years, and now it is back to doing what it was born to do.

I thought a new battery would fix my Roomba, but no such luck. Mother's Little Helper scoots around the house just fine now - so I guess that means the battery works. Unfortunately, other than just looking kind of cool, Roomba is completely worthless, because it doesn't pick up a thing (it reminds me of my husband!).

Works great so far. For the first couple of times, it seemed like it didn't hold a charge as the Roomba didn't start, but I took the battery out, waited a minute and put it back in. I just felt that it "reset" it for some reason and now it works fine.

Good batteries, but their lifetime isn't as good as I'd like to see. Best case 2 years.

I had a Roomba that I thought was ready for retirement, but I took a chance and bought it a new battery. Now, it has a new life and works just as well as the newer one I purchased! I am so happy for the new life these batteries have given my older and newer Roombas!

These are a great bargain! They are about half price! The package arrived on time, in great packaging. I have ordered these before, and they hold up as well as any that you would order from the manufacturer. Great purchase!