Cost

-1.5ah-3ah rebuilt to a 2.7ah high output $45

-3.0CP rebuilt to a 4.5 extreme output $55

-5ah rebuilt to a 5.0ah $65

-5ah rebuilt to a 5.4ah high output $75 (can not be done on all 5.0 cases)

-6ah to 8ah rebuilt into a 8.4 ah extreme output $120 or

-6ah to 8ah rebuilt into a 9ah extreme output $140

-9ah rebuilt to a 9ah $110

-12ah rebuilt to a 13.5 extreme output or 

-12ah rebuilt to a 15ah high output $175

(13.5ah is more for demanding tools, over the 15.0)

Some sizes are in stock, if you do not have one to rebuild, message for current availability.

M18 Balancing $10, recommended once a year to extend battery life

2ah rebuilt to a 2.7ah high output $50

4ah-5ah rebuilt to a 5.4ah high output $70 

1.5-2ah rebuilt to a 2.7ah high output $50

4ah rebuilt to a 5.4ah high output $75 

XTR series

4ah rebuilt to a 4.2ah high output $75

Greenworks

80v 2.5ah rebuilt into a 2.7 ah $165

Other brands and projects welcome as well.