I've got a Bosch ps30 drill that uses bat411

The cordless drills I have purchased even good ones like Ryobi lasted about three years The drills will work good but the batteries go dead after a while. My Ryobi I keep one battery charging in my charger all the time but before you do this check your manual to make sure its ok. I change batteries every two weeks when not in use all the time. I never have a run down battery that way.

You cannot over charge a battery pack as the charger stops at full charge. However by recharging a partially used battery pack you can develop a memory in the pack that the charger will not charge past

You shouldn't have to remove any parts, except the battery itself, to charge the PSR12. I did find a breakdown of your drill that shows a 'Battery Retaining Clip' that is a heavy, u-shaped wire that goes into the front of the housing section just above the battery. It may have to be removed to get the battery out.

First The model is pretty new. you need to register your tool on line. this takes you from a one year warranty to a three year warranty. They will give you a pro-vantage number. with that said it sounds like a trigger switch. Yhe trigger switch is the brain of your tool. not only does it do your variable speed but it also controlls the brake and your fuel gauge. Because of the cost I highly recomend taking it to your closes Bosch service center.

Hello
The motor windings in the drill are bad or have a bad connection.You may also try cleaning the battery contact points with a pencil eraser.

I do not recommend connecting anything but the factor charger to the battery. No 12v will not not charge an 18v battery.
They can BLOW UP if you apply too much current.
The correct charger can be found cheap. Look on craigs list under tools.
Good Luck

Usually the problem is in your battery, they develop a memory, they will only charge to a certain point. This can happen when the battery is recharged when it is not completely dead.
The key is to let the battery go completely dead, before recharging. I will wait till the battery is dead, then tape the trigger down and let the drill run till it won't move any more.
Sometimes you can reverse the battery memory, by doing the above, but when the battery is that bad, you might need to start with a new battery, and make sure it is completely drained, before charging it.
Wish you the best of luck.
Sincerely,
Paul Gibson

Hi Fred,

I have several 18v tool sets and for the most part I'm quite satisfied with their performance. I currently use Bosch and Ryobi.

When used with the drill, a battery can last me the whole day. On the other hand, the sawzall will eat them up pretty quick.

The thing I've found common to all brands is that it is absolutely crucial to make sure the batteries are fully charged before they get used for the first time. That first full charge seems to set the bar for subsequent charges for the rest of the batteries life.

I too, have tried the discharge/recharge thing. No help. I can only suggest a new battery and letting get all it can take from the charger the first time out of the box.

Since I've been doing that, I rarely even think to bring my charger to job sites, there's that much of a difference in performance.

Hope this helps you out.

Best regards,
Mike

sounds very much like the batterys we used to have ryobi drills but the batterys dont last now we use makita/dewalt/bosch