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NiMH Rechargeable Battery: 14.4V 4.2Ah (MH-SC4200) for iRobot Roomba 4905 400 series Vacuum Cleaner

Option 2: With Battery Box
Option 2: With Battery BoxOption 1: Without Battery BoxOption 1: Without Battery BoxOption 3: Battery w/ Box & Charger Combo
Your Price: From $79.95 to $114.95

Product Options

Combo Option:
 Packing  NiMH battery pack is made of 12 pcs High quality Powerizer brand NiMH sub C 3300mAh cells and packed in 2x6 configuration.
  • This NiMH Box Battery is compatible with all Roomba FloorVac models and has 11% more running time than the OEM battery pack. Compatible with the following models:
    • iRobot Roomba 400 Series (Model #: 4230, 4110, 4225, 4910, 4330)
    • Discovery Series
    • Create Models
    • Dirt Dog Models
  • Provides up to 100 minutes of run time
  • 50 percent greater useful life than original Roomba batteries
  • Easy to charge and connect
  • Can be recharged up to 1000 cycles
 Voltage  Voltage:14.4 (working), 17V ( peak), 12V ( min.)
 Capacity  3300mAh, 47.52Wh, 
 Protection  10K @25C thermistor installed in the battery pack. Power will be cut off if battery temperature is above 70oC during charging to prevent from over charge.
 Max. Discharging rate

  4.2A limited by polyswitch

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   For a faster charging, You may charge the pack by Multi-Current Universal Smart Charger for 9.6V - 18V NiMH Battery Packs (Tamiya Plug) , UL Listed (CH-UN180) + connector adapter

  • 2.2 hrs charging time by 1.8A charging current
  • Due to the internal temperature sensor (white wire) installed inside the pack, Please don't connect charger's temperature sensor wire from the charger to battery. 
 Battery Dimensions(LxWxH)   5.35" (136mm) x 1.77" (45 mm) x 1.77" (45 mm)
 Battery Box Dimensions(LxWxH)   7.09" (180mm) x 2.0" (52mm) x 2.1" (53mm)
 Battery Weight
  714g ( 25.2 Oz.)
 Battery w/ Box Weight   38.5Oz (1091 grams)
  • Please never short circuit the battery
  • Do not discharge the battery pack below 12V ( 1.0 V / cell). Deep discharging may damage NiMH battery pack.
  • For more safety warning please see the link here
  • Please check and match the polarity of our connector to your device. We are NOT liable for any damage to your device due to reverse polarity
 How to Change inside battery
  • The most troubles of Irobot was caused by dead battery because OEM did not use a high quality cell.  You shall try to replace a inside battery pack before throw it away , as the following picture --- It is easy and fast
  • There are some battery case that is glue shut. You have to exercise caution on pry open the case as we are not responsible for any damage to the case


Original Roomba Battery case


Loose all screws on the top. You need a triangle screw driver to do so. You can make a triangle screw driver by grinding machine, or add the option for the screw driver

  • Open the cover which may glued.  You may need a flat screw driver to open it carefully
  • Note: Please pay special attention to where the terminals need to go. The picture above does not indicate the correct locations for the metal connectors. (There is indicator on the bottom.) The Red wire goes to the outside terminal and Black wire goes to the inside terminal


  • Take out the old battery by pulling up the metal contacts of the three wires. Cut the wires about 2 inches from the metal contact.
  • Put new battery into the case and solder the three wires back to metal contacts. Please make sure polarity is corrected . 
  • Double check battery polarity with a muliti-meter before connecting battery
    • Red wire :  battery positive
    • Black wire: battery negative
    • White wire: temp sensor
  • Then reverse above procedure to close battery cover.
Notes Things to know about Nimh Batteries

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Product Reviews

(9 Ratings, 9 Reviews) Average Rating:
I finally got Roomba running again,I love it!
silviu2003 (Toronto, ON) 6/12/2014 11:55 AM
Was quite impressed with the quality of battery and charger. I finally got Roomba running again. Low charging time and long running time: I love it! But shipping sucked! Please! Please! Please add a RED WARNING for U.P.S. Canada! Worst possible shipping choice: they wanted $44 extra on top of the $20 already paid and held my package for ransom. I escalated and paid only duty & tax but the driver refused to hand me the package and was rude. There's no communication between UPS departments! Spent hours on phone, 8 calls!
everything worked smooth
pepsamar (Barcelona, 08008 Spain) 6/12/2014 11:54 AM
My experience has been fantastic, very fast response and adaptation to my personal needs. The item was sent at a lighting speed. As a critic instructions for the battery charger are not clear but everything worked smooth.
surprised at how quickly the battery showed up
rturpin (Stockton, CA) 6/12/2014 11:53 AM
I was very pleased with the order process (web page organization, etc.), and quite surprised at how quickly the battery showed up. Appreciate your good service.
Easy as Pie
D. Jones (ANTHONY, FL) 6/12/2014 11:52 AM
I like the Roomba but having to replace battery packs on an annual basis made it a little more investment than what I wanted. It was really easy to swap out the packs. Just follow the instructions. Now I need to order the trickle charger and another set of cells to replace another dead cell set.
highly recommend
Dr. Gilles Lamarche (Marietta, GA ) 9/25/2013 9:56 AM
Price seems very good compared to buying from Roomba directly. merchandise is of similar quality.
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We own a national standard UN38.3 testing lab. We can provide UN38.3 test service to our customer.

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