Instructables

Hot Rodding a Power Drill Battery

Step 2: Replacement Sub C Cells

At this point I came back to reality. The racing batteries alone would cost a hundred bucks. So, I settled on a brand name NiCd cell from GP. The main difference from the stock batteries is that these are 2000 mAh cells and the stock ones are only 1700 mAh...so I should get more run time...basically a bigger gas tank.

These fellas cost me $1.79 each for a grand total of $21.48 from Budget Batteries. So far so good.

In case you aren't good at math, a 14.4 battery takes 12 1.2V cells to make up a pack.
 
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