Think Crucial Replacement for iRobot Mint 7.2v 1500mAh Battery Fits 4200, 4205, Braava 320 & 321, Compatible With Part # 4408927, Long Lasting & Rechargeable HIGH QUALITY VACUUM PARTS that leave you in control of your vacuum's destiny. Restore your old friend to like-new conditions! This rechargeable battery is rated for 7.2v, 1500mAh and fits iRobot Mint 4200, 4205 & Braava 320, 321 Vacuums. EXACTING DESIGN TO FIT YOUR LIFESTYLE. This battery lets your vacuum charge to full capacity, run longer, and clean more thoroughly. EASY TO INSTALL so you can get back to cleaning as soon as possible! Parts are easy to install with a basic set of household tools! Compare to iRobot Part No. 4408927. SAVE YOUR WALLET! Parts made by Crucial Vacuum are rigorously designed, tested, and engineered to be just as good or better than OEM parts. And you get them at a fraction of the cost with FREE SHIPPING on every order. GUARANTEED SATISFACTION because of a 30 day full money back guarantee and a trusted Think Crucial warranty. We are so confident in our products that we have no problem giving you every penny back if you're unhappy with your purchase. You won't see promises like that from big box brands!