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

Average Reviews:

(More customer reviews)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.

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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

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