Dell Home offers its Dell 48 WHr 6-Cell Lithium-Ion Battery, model no. 9JR2H, for $99.99. Coupon code "ADD10%OFF" drops it to $89.99 and adds a $50 Dell eGift Card. (The gift card will be emailed to you 10 to 20 days after purchase.) Assuming you'll use the gift card, that's $90 off and the lowest total price we could find. It's compatible with a range of Inspiron and Vostro models. Deal ends August 3.