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

• Amazon Sales Rank: #11174 in Consumer Electronics
• Brand: Tenergy
• Model: 91049
• Dimensions: .0 pounds

Features

• 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

Customer Reviews

WORKS GREAT!! You need to know the details before you do this!
You need to know that iRobot corp. makes it difficult to change this battery. After removing the screws, I found that the yellow battery case lid is glued to the bottom of the case. You need a couple of straight, small screwdrivers to slowly tap open the glue seam much like a diamond cutter uses a tiny chisel to tap cut a diamond. I had to tap the seam every 1/4 inch to break it loose. Hit it too hard and your cost savings are gone if you break the case at the attachment points - you would need to buy the whole battery pack - so only do this if you are careful and patient. Removing the old battery pack also is challenging if you are not the careful type as it is glued to the base of the case internally. Cutting the wires and soldering the leads is easy but there is no room for any other attachment method so you had better be confident in your soldering skills. This is not a job for the impatient person and you had better have all the right tools but since I am a nerd geek, I enjoyed the challenge and IT WORKED GREAT!! CHOOSE YOUR BATTLES AND KNOW YOUR SKILLS and if this sounds fun and challenging (like I do), it is a great way to save $40.00 AND set it up to do future battery replacements more easily.

Works great, but you had better be "handy"
The good news is this product works as advertised and is significantly less expensive than other full battery replacements (which include the outer case). The bad news is you have to be prepared to do quite a bit of work to disassemble the old battery case, replace the old batteries inside, and reassemble the case -- all without instructions. This is why my overall rating is only 3 stars (due to the complexity of the install).

In detail, here are the steps you'll need to know:
1) For pictures and some basic online instructions, do a Google search for "batteryspace NiMH IRobot Roomba" (without the quotes).
2) Start by removing the battery case from Rumba (simple).
3) Using the provided screwdriver, unscrew the Rumba battery case
4) If the top lid does not easily come off after unscrewing the triangular screws, it is likely that your case is also glued shut (most seem to be this way). You'll need to use extreme caution and patience to carefully pry/cut/chisel off this lid without breaking it. To do this, I used a combination of some flat-edged screw drivers with some gentle taps and a sharp utility knife. This part alone took about an hour and is by far the biggest challenge in this build.
5) With the lid off, you can remove the old batteries and de-solder the leads that are connected to the 3 wires. I suggest you record which lead goes to which wire.
6) In my build, I had to shorten the wires with the new battery pack (far too long to fit otherwise). I determined the new length by installing the battery pack into the case, routing the wires the same as in the final assembly, and clipping each about 1 inch beyond where the lead would be located.
7) Solder each wire to its respective lead.
8) Put the new battery pack into the case and assemble leads into case.
9) Screw the top back on and pop it back into your Rumba.
10) I let mine then charge overnight for a solid first-time charge.

Having said all of this, I'd still do it again, especially since the hard part (taking the glued lid off the case) has been done. A future battery replacement will now be simple and pay me back a savings of $35 - $40 with each replacement.

A "new" battery for less than half the cost.
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.