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Tenergy 14.4V 3800mAh NiMH Battery Pack for IRobot Vacuum Cleaner 400 series such as Roomba 4905 --New!! A Screwdriver included

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Brand: Tenergy
Category: CE

Buy New: $28.99

New (4) from $28.99

Avg. Customer Rating: 3.5 out of 5 stars

6 reviews

MPN: Robot14.4V3600
Model: Robot14.4V3600
UPC: 851197001994
EAN: 0851197001994
ASIN: B001AG4EHI

Availability: Usually ships in 1-2 business days

Customer Reviews:

Showing reviews 6-6 of 6

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A "new" battery for less than half the cost. June 23, 2008
13 out of 14 found this review helpful

My Roomba would only run a maximum of 10 minutes per charge, so I suspected the battery was the issue. I priced out replacement batteries, but it seemed the cost was prohibitive considering I could buy a entirely new Roomba for only $25-$30 more than the battery itself.

I finally located the Tenergy replacement cells and thought this was a good option. I replaced the cells of my Roomba APS battery (the yellow one) with minimal effort. I removed the screws of the battery case with the triangle shaped screwdriver which was included with the kit. The case of the battery was a little difficult to pry open but once it was I simply cut the three wires from the old battery and removed it.

I then soldered the new battery pack leads into place. There are three color coded leads (red, black, white) and you just need to match the colors. I suppose it wouldn't be absolutely necessary to solder these, but I didn't want to deal with a loose connection down the road. I also used a small piece of heat-shrink tubing on each lead, but electrical tape would work also.

Finally, I screwed the case back together. Note that the replacement cells were a tight fit into the case, but with a little adjustment to the position of the leads I was able to get the case back together with no major issues. I then used a multimeter to measure the voltage at the prongs of the battery and confirmed my connections were working. The new battery measured almost a full volt higher than my old one even after the old one was fully charged, so I am confident this will resolve my issues and thus far it appears that it has.

I run my Roomba while I am at work and haven't had an opportunity to time it yet, but I can tell by the amount of dirt in the bin and the tracks on the carpeting that it is back to it's old self. Based upon the size of the area it is covering, I would guess it is running at least an hour on one charge, so I have no complaints about battery life at this time.

I have no way of knowing if the lifespan of this battery will be better than the factory battery, but considering the factory one only lasted about a year I surely hope so. All things considered it was well worth my time to replace the cells as the five minutes it took saved me at least $30-40. In fact the longest part of the entire replacement was waiting for my soldering iron to heat up.

My only complaints are that there were no instructions included (not that I needed them, but I can see some people might find them beneficial) and the battery was shipped in a non-padded USPS envelope rather than a proper box to protect it from shipping damage.

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