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

• 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

• RB-ROOMBA400: Battery With yellow enclosure included
• Tab Charging terminal. (Right most = Positive)
• 
• RB-HSC12R2WR33: Battery Only, No yellow enclosure included
• Charging / Discharging Terminals: 6" length Open End Wires
• RB-ROOMBA400C01: BAttery with battery box & charger combo:
• 1 pcs Multi-Current Universal Smart Charger for 9.6V - 18V NiMH Battery Packs (Tamiya Plug) , UL Listed (CH-UN180) 
• 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. 
• 1 pcs Connector/Adaptor: From Standard Male Tamiya to 10mmx6.3mmx0.8mm tab
• Utilize for connect between CH-UN180 charger and battery while charging. 
• Red wire = positive
• Black wire = negative
• Tabs dimension(LxWxH): 10mm(0.4")x6.3mm(0.2")x0.8mm(0.03")

  4.2A limited by polyswitch

   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. 

• 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
• 

• 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.