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

Sunday, July 12th, 2009 at 2:34 pm

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

Manufacturer: Tenergy
Customer Rating:
List Price: Varies based on product options
Sale Price: $29.99
Availibility: Usually ships in 1-2 business days

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Product Description

Features and Benefits * NIMH High Power 14.4V 3800mAh rechargeable battery * 70 oC thermistor installed in the battery pack. Power will be cutt off if battery temperature beyond 70oC during charging to prevent from over charge. * 6" length wires is pre-installed for easy installation. * The battery is designed for exactly replacing inside battery pack for IRobot Vacuum cleaner. e.g Roomba APS 4905 battery. - To replace inside battery, you need to take off 4 screws on the case, then put new battery with solid connection. - Please make sure polarity of battery pack. Red wire is always connect to positive * TECHNICAL SPECIFICATIONS: - Votlage: 14.4V, made of 12 pcs High quality NiMH sub C cells. and packed by 2x6 configuration - Capacity: 3800mAh - Max. Discharging rate : 10 C at 33 A - Dimension: 136 mm L x 45 mm W x 45 mm H. - Weight: 38.5 Oz. * Battery Installation Instruction: Step 1: Loose up all srews on the top cover of the Roomba Advanced Power System. Tool: You need a triangle screw driver to do so. Step 2: Open and remove the top cover from the power system, which may be glued. Tool: You may need a flat screw driver to open it carfuelly Step 3: Remove the old battery inside. Three are wires with metal contact connected inside. You can remove the wires by pulling up the contat or cut wires off. Take a note of the wire connections Step 4: Put new battery into the battery case and solder three wire back to metal contacts. Follow the note taken in Step 3 or the following details for re-wire: - Red wire : battery positive - The red wire must go to the terminal farthest away from the battery - Black wire: battery negative - metal contact near edge - White wire: temp sensore - metal contact on other side Step 5: Put back the cover Step 6: Screws on the cover

Product Details

Compatible with all Roomba FloorVac models.
Up to 120 minutes run-time
The battery is designed for exactly replacing inside battery pack for IRobot Vacuum cleaner. e.g Roomba APS 4905 battery.
Can be recharged up to 1000 cycles.
To replace inside battery, you need to take off 4 screws on the case, then put new battery with solid connection. Screwdriver is included

Video Reviews

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Customer Reviews

Great lower cost alternative to a new Roomba Battery

Review Date: May 14, 2010

Reviewer: Darryl Kuhrt, Boise, Idaho USA

This is a great alternative to buying a new Roomba battery. Not only does it cost less, but it boasts a better battery capacity (longer life per charge) of 3800mah versus the original battery's 3300mah. If you enjoy the do-it-yourself approach to fixing things, you'll get some great satisfaction for very little effort and significant cost savings to boot! This battery "core" is a perfect fit replacement and they include the triangle-tip screw driver needed to open the battery case. Just three wires to solder, re-assemble the battery pack (eight screws), and your Roomba is back in business! To be "green", don't forget to recycle the old battery core!

Terrible battery life

Review Date: April 9, 2010

Reviewer: J. Nixon,

Changed out the Roomba battery pack, charged the new pack for 24 hours, and used the unit once a week. Now, four months later, the power light goes yellow within a minute of starting the Roomba. Clearly the battery no longer holds a charge well. Buyer beware.

good for a few months

Review Date: December 31, 2009

Reviewer: Normal Joe, San Jose, CA

I got this back in December 2008. The install process was not difficult since I am an EE person. It all worked great for a few months, then I noticed that it would seem to get stuck without finishing up the room. So, I ran it during the day one time and noticed that after leaving the charger the light immediately became yellow, indicating low charge. After a few more minutes it would turn red and then stop. I turned off the scheduled cleaning and have not tried to use it again til recently, December 2009. It runs for 1 minute then stops. The original battery lasted me about 2 years and would still vacuum maybe 10-15 minutes when I bought this one.

In the end, I guess you get what you pay for. I would recommend getting the original battery or at least a battery from a more reputable company...

Worked well for 6 months

Review Date: December 24, 2009

Reviewer: JohnKes, San Jose, CA

It worked well for 6 months. Gave >1 hr of vacuuming time while it was good. Then it went downhill fast.

The design is 12 cells in series. Turns out that if even one cell is weak, the other 11 will quickly ruin it, and kill the whole pack. No one makes a battery pack that gets around this design flaw. There is a Roomba hobbyist (on the internet) who has taken his battery pack and soldered bypass diodes across each cell to prevent this breakdown. That is the only way around this problem.

I bought it, and used it....

Review Date: September 25, 2009

Reviewer: Robert Williams, Seattle

Believe everyone who advised you to get your case open before buying the replacement insert. I nearly broke off the clip while I was chipping away at the glued shut case. *TIPS* The ends are the hardest part to pry open because they are glued on a ledge you cannot tap open because of the clips and metal heat sensor. Use a sharp razor blade (like from a paint scraper) rather than a screwdriver, much easier. I installed the battery and my roomba still does not work, but I found a website that has a complete tear down [...], with the parts labeled so there is still hope. I also found a diagnostic you can run before the purchase of a new battery[...], which I haven't tried yet because your machine has to be charged to run the diagnostic tests. I hope this helps, my rating is in the middle because I don't yet know if the product works, but it was easy to install, arrived quickly, and had all the parts as promised.