Editorial Product Review:Item Description:12V Nickel Cadmium Battery, For Model 9866, 2A Hour Cells.
Amazon.com Item Description:Get more power and run time from this re-designed battery pack by Porter-Cable. By eliminating the 'tower cell' that resides in the post of clip-on batteries, this slide-on battery keeps all cells on an even playing field. This prevents premature failure of the battery due to one cell taking more abuse from charging and discharging than the others. An added benefit is that the slide-on style is much easier to remove and replace than typical clip-on style batteries. The 2 amp hour capacity provides more power and longer run time. It fits Porter-Cable's 9866 12-volt drill and 869 flashlight.
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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I guess it will do.
These hold the charge a little better then originals, but nothing out of the ordinary. The price is ridiculous for a product that was not improved significantly. there is no reason why they could not go with a LiIon battery as a replacement.
Customer Rating: 
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Porter Cable Battery
This battery was an OEM battery, exactly as advertised. It has given my old cordless drill some much needed new life.
Customer Rating: 
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Bassett review
The product was fine, but the process of ordering created a double order which meant a return shipment. The system would not let me easily cancel the mistaken duplicate order. Ken Bassett
Customer Rating: 
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Porter Cable 12-V battery
I have had my Porter Cable 12-volt drill for several years. The drill still works well. It is less expensive to replace batteries than purchase a new drill with comparable power and reliability. The new battery works very well.