Looking for a suitable power supply to recharge 18 volt Li-Ion battery

John Arnold's picture

Offline

Joined: Oct 28, 2020

Replies: 3
Looking for a suitable power supply to recharge 18 volt Li-Ion battery
October 28, 2020 - 1:27pm

Recently the power supply for the charger for my cordless drill failed.

The manufacturer no longet stocks the power supply.

The battery to be charged is 18volt. The battery fits onto a carging cradle (which controls the charging) and a power supply (the faulty one) plugs into the cradle.

The (faulty) power supply is rated at 21 volts dc 1.4A.

I cannot locate a power supply which has an output of 21volts but can find one which outputs at 20 volts and another one which outpits at 24 volts (DC rating mA are ok for both).

Would the one rated at 24 volts be unsuitable? If so what about the one rated at 20 volts (same as nominal voltage of rechargable battery) - the 24 volt one is cheaper than the 20 volt one which is multi voltage but would the voltage be too high?

Both are switch mode type.

Thanks

John

John Arnold's picture

Offline

Joined: Oct 28, 2020

Replies: 3

The charger I can locate which is rated at 20 volts is NOT the same as the nominal battery voltage (which is 18) NOR is it the same as the faulty power supply which is rated at 21 volts.

 

Sourav Gupta's picture

Offline

Joined: Feb 12, 2018

Replies: 360

share the drill model number or charger model number

John Arnold's picture

Offline

Joined: Oct 28, 2020

Replies: 3

The drill may only be available in Australia as it is only sold by one particular hardware chain and seems to be their own brand (the importing company named OZITO is in Australia).

Anyway here is the data -

Cordless drill     OZITO  LCD-5000

Cradle    no model stated but on it is "use only charge transformer HYCH0302101400S

Charger    OZITO HYCH0302101400S  Input 240V AC    Output 21V DC 1.4A

I have 'googled' the charger model but only found listings for people also wanting the charger and of course OZITO.

John

Debashis Das's picture

Offline

Joined: Dec 02, 2019

Replies: 109

You can suarly buy a 24V power supply used to power LEDs. As those power supplys comes with a trim pot, the output voltage gets down to 19.8V.

you can search "24V 5Amp DC Power Supply" on YouTube for Reference.

 

John Arnold's picture

Offline

Joined: Oct 28, 2020

Replies: 3

Would using a 24 volt power supply cause damage to the charging cradle which states that a 21 volt supply should be used. There is a circuit board inside the charging cradle which I assume controls the actual charging eg switches off when fully charged etc.

OR would a 20 volt charger have a high enough voltage to charge the battery?

Sourav Gupta's picture

Offline

Joined: Feb 12, 2018

Replies: 360

It depends on the circuit level construction. Typically a 24v charger may work...but since the company stated 21v there must be some Reason due to the off bit 21v which is rare. However...you could try 24v but make sure to select one where the output voltage can be controlled upto 21v.