Usb charger from a makita battery - Makita 2 Bl1830 18v Battery,dc18ra Charger Lxt Fr Drill

Yes, because the voltage and amperage input to the charger is constant, so the board management dumps excess charge once the battery is fully charged. The battery cools, but the charger warms up. Mine does the same. It is a 15 minute charger, so the current is high.

Makita DC18RC 18V Lithium-Ion Rapid Optimum Charger

https://www.amazon.ca > Makita-DC18RC-Lithium-Ion...
Industry leading charge times of 15 min. · During the charging process, the Rapid Optimum Charger monitors actively controls the current, voltage and temperature ...
Battery Cell Type: ‎Lithium Ion
Style: ‎Plug
Batteries Included?: ‎No
Power Source: ‎Ac

Based on experience I can tell you that it is is generally the temperature/cutoff/individual cell monitoring sensor in charger that dont allow the batteries to take a charge. Once the same condition is detected 3 times by the same charger it considers the batteries to be bad and refuses to accept it. I have 2 batteries that wont charge on one charger but works perfectly fine when i charge it on my other Makita charger so basically there is no problem with my batteries.
I would suggest first you check the voltage of your drained battery by a test multimeter. For 18volt battery if it is close to 18volts 1-2 volts less is just fine! Then there is no issue with your battery. Makita chargers are very expensive hitech which is useless in my opinion the lipo chargers (used in rc hobby) example skyrc are better quality cheaper and does a better job and you can easily charge your makita battery with it as well but this is only recommended if you decide not to go with Makita charger any more. Some basic information about multi chargers for Li-ion battery to follow the safety is make sure you use the right connectors with correct polarity. For 18v volts max voltage should not exceed more than 20.50 and the allowable charge current is 2.7amps also ensuring that batteries dont heatup.

The DC18RC are most likely to charged the BL1830 battery, which is the most popular of 18V Makita power tools. It is a Li-ion battery.

And the DC18RC battery charger has two volt 110 Volt and 240 Volt.

The 240 Volt DC18RC charger can replace model DC18RA & DC18SD because of its improved performance and full compatibility with Makita's NEW 'Star' labelled batteries that communicate between the tool, battery & charger. And, it is a fast charger.

It can charge a Makita BL1830 Battery in approx 22 minutes.

But, I do not recommend to convert a makita charger model DC18RC at 110 volt to 240 volts.

The reason is as below:

1. This will void product warranty ! If you follow this mod, you do it on your own risk !

2. There are several comments that described
same model # but with different design and components.
Please beware that this mod might not work on your charger
or worst, will damage it.
Only perform this mod if you know your way around with electronics !

Check that you have the correct battery in the charger as the charger will not charge any type of battery, only the battery type listed on the panel.

Take the liberty to disturb:
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You can get a 18V replacement Makita battery for your drill. The replacement one is cheaper. Replacement MAKITA BL1830 battery pack 100% compatible with the original BL1830 battery, high quality, wholesale price.

http://www.drillbattery.com.au/buybattery.php/makita_BL1830_power+tool+battery.html

If the charge count on the batteries is under 300, Makita will replace them. Makita has a known defect in this battery that causes the battery to shut down before it is dead. So as of now they are exchanging ones with low use.

If they are truly defective and makita won't replace, you have to open them, find the dead cell or blown fuse, and replace. Search youtube makita battery for a video on repairing this battery. But once the red and green lights on the charger flash, the the battery can't be charged on a Makita charger -- it's been locked. So use a third party charger.

Maybe your battery is died, you can replace it on

http://www.drillbattery.com.au/buybattery.php/makita_1220_power+tool+battery.html