I bought a rechargeable drill and used it to put up about 180 feet of 6 feet tall wood fence plus I use it for many other projects. Under heavy load battery is dead pretty quick. Under light load battery lasts a long time. Battery says 12V 1.3ah. Battery charger that comes with the battery says nothing. After experimenting several times I learned 2, 4, 6 hr charge is not enough, 8 hr charge seems to be perfect, charge longer than 8 hr is no better than 8 hrs. If I don't use the drill for 2 weeks battery is dead. If I don't use the drill for 1 week battery is very low. I have to remember to put battery on charge the day before I plan to use the drill. I get tired of the battery being dead every time I go to use the drill so I put battery on charge then get side tracked on other things while waiting for the battery it gets charged for 2 weeks sometimes. The battery is so irritating being dead all the time so now I leave it on charge all the time. After a year being on charge battery is getting so it only holds a small charge and goes dead quick. Soon the battery will be like the other 3 drills & 3 batteries, it will not hold a charge any more. These are Harbor Freight $15 drills sometimes the batteries last longer than the drills.