I have a 3.9 volt bluepoint cordless screwdriver but i lost the charger can i use my 13.5 volt power supply to charge the screwdriver i plugged it in and the for about 45 seconds and it worked i just want to make sure that i dont burn the charging system in the screwdriver so i need to know if its safe to use the 13.5 volt charger/power supply on the 3.9 volt cordless screwdriver

I have a Milwaukee cordless screwdriver.
The charger lists Input at 120v AC, 60hz, 100mA : Output at 2.4v DC, 1.4 amps
The battery says 2.4v 2400mAh (Ni-MH)

Why do both the battery and charger get so hot (almost too hot to touch) when charging?

My husband has asked for a cordless screwdriver for Christmas - I don't know anything about them (neither does he) and there are hundreds of them. It would be used for general household DIY but I know he would like it to be good quality. I've tried searching in on-line etc. but nothing came up that was really helpful...

I am building a small solar powered machine (barrel tumbler) and would like to power the drive motor (salvaged from a cordless screwdriver) with solar cells. In order to keep the duty cycle on the motor low I would like it to operate only under full sun. If I wire a zener diode in series with the motor with a breakdown voltage slightly less that the solar cell arrays output in full sun will that work? I would like to avoid using a battery, charge controller, and timer circuit to regulate for simplicity and cost purposes.
I had planned on using a 3.6V cordless screwdriver motor and gearset to turn the drum. I figured the startup amps for the motor could be determined with a multimeter and then the solar array sized accordingly.

I know zeners are typically used in parallel with a voltage source as shunt to regulate voltage but in this case I'd like to try using it in series to only allow current through in full sun.

Don't really have any specific numbers yet as it's beeing planned and specific components haven't been sourced yet.

Based on your response, the voltage drop across the zener would be 10Volts. I thought when they broke down they were essentially a short, which is why I'd like to wire it in series.

Power wasting is not of concern as the the device is to turn the drum a bit once an a while so I don't have to do it manually....because I'm lazy and forgetful. I suppose if it shortened the life of the diode I would be concerned about that.
the best I can do on the numbers is that the array will be series up out of 0.5V cells to get around 3.6 volts and then paralleled up to get the required current. the actual wattage expected wuring operation through the circuit would be on the order of 2 or 3 watts, 5 at the most.

My uncle just bought a new cordless screwdriver, and he gave me his old one. The reason he got the new one is because the old one, the 3 prongs that grip the bit 2 of them are broken. Will I be able to take this to sears and get it replaced or get parts to fix it? Its several years old, but don't all Craftsman products have a lifetime warranty? or even if they won't replace it where can i get parts to fix it?
did u need a receipt for it? cause this is probably 3 years old n i have no receipt
bart s lol good idea haha

truth only, non of that, it's the thought that counts..my best was a cordless screwdriver, always wanted one, the worst was, bath salts, i hate bath salts

I just purchased a Coleman cordless screwdriver that has an Ultracapacitor instead of a rechargeable battery. It recharges in 90 seconds. Does anyone out there know any other product that uses Ultracapacitors in products in the marketplace?

I have a cordless screwdriver and it has nicd battery back 2.4 V 600 mAh and it doesn't hold the charge so I read about nicd battery resurrection guide..
do you think we can resurrect any nicd battery ?
can you suggest on how to do it?