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The most easiest way to be sure is using multimeter.
Set your multimeter to highest dc volt. All chargers have output voltage information written on it (Must be written as "output" value or "sec"). Measure charger's output pins (which connects to battery) and be sure measured value matches with output voltage value written on charger label. If it doesn't match each other, buy a new charger and proceed with below part.
Discharge your battery. Once you discharge battery; be sure that there is no charge at all. Charge battery for 15 min. Measure battery power with multimeter again. If there is no charge at your battery, it is dead and you need another battery.
There could be a variety of reasons for the battery malfunction, some of which are listed below:
a) low battery voltage due to long term storage without charging (>1 year, charger will not charge if the voltage is too low. What is the voltage?),
b) cell imbalance due to shorting out the terminals (was the battery used for other purpose than running power tools?),
c) internal corrosion caused by exposing the battery to damp environments during its life (need to open the battery and look for signs of corrosion on the cells. Was the battery left out in the rain at some point in time?),
d) battery age, ie, the cells may have reached their end-of-life based on the number of charge cycles (what are the estimated number of cycles?),
e) faulty charger (does the charger charge other batteries?),
f) internal battery damage with broken connections (has the battery been dropped or mishandled at some point?).
More details should be provided before suggesting possible solutions.
Generally, When your have the 18V milwaukee drill, you had better to use the same voltage battery charger to charge the battery. it will be more safe. John. http://www.anybatteries.com.au/battery-model.php/Power-Tools-Battery_milwaukee.html
I checked a couple sites and would suggest calling RYOBI parts supplier at 1-877-545-4099 to ensure that you get the correct charger. They might ask you what the model nnumber and the voltage and type of battery so have these numbers handy. Let me know if you need more assistance.
NO! Never charge lithium batteries in a charger designed for nickle based batteries like the NiHi your old charger was meant for. Ryobi did design the new Lithium charger to be backwards compatible so you can charge your older 18V NiHi batteries in the Lithium 18V charger.
Also note, NEVER miss-match the voltage, for example, make sure you are not trying to charge 12V batteries in an 18V charger unless the manufacturer has specifically stated that the charger is capable of multiple voltages.
You should check first using multitester, the voltage that comes out of the drill charger. if the stress is normal in accordance Battery voltage required by the drill, the damage there is on these batteries, the batteries serve targeted cell is damaged or broken connections between cells in these battrey. so the charger can not charge battery, indicator lights would not light up.
make and model would help, general help do you have voltage tester? if so look at charger and find voltage output, test contacts and if lower than listed charger has gone bad, also clean all contacts with pencil eraser to make sure they are clean on battery and gun, if charger is good and contacts clean either battery is bad test in another device or test voltage, if battery good the drill is bad