Im trying to find out if my charger needs to be left in for 12 hours or more for a trickle charge or whether I can unplug it once the green light has stopped flashing?

My Ryobi 18V One+ charger blinks green while it's charging. When the battery is fully charged, the LED goes to a solid green. However, one battery recently had a faulty cell. After several hours on the charger, the green and red LEDs both were blinking. That indicated that the battery failed late in the charging sequence. It didn't fail the initial testing by the charger. The other battery I charged that day charged fine.

The extended capacity batteries can take 12 hours to charge in my experience. The regular batteries take less time. The charge time will depend on the battery chemistry(The older NiCd batteries take longer to charge then the Lithium batteries.)

I hope this helps. Assuming you aren't dealing with a cold or hot battery or charging environment, if you have any suspicion about a faulty battery, replace it.

Cindy Wells
(Note: I have a 12V drill as well. Those batteries takes longer to charge for the same relative capacity than the 18V NiCd batteries.)

Trickle chargers keep the battery fully charged.
They usually have a small cube-shaped transformer with a cord and plug or alligator clips.
If you look on the cube part label it will tell you the "wattage" , probably around 20 watts or similar.
This means while it's in use it draws 20 watts through your electric meter, the device that calculates your electric usage/bill.
You are charged for kilowatt hours.
To calculate how many kilowatt hours the trickle is using
multiply 20 X 24 hours X 31 days in a month .
Or 14,880 about 15 kilowatt hours a month.
In Florida a KWH is about 12 cents so it would cost you about $1.80 a month to trickle charge.

Once the green light has stopped flashing the batteries should be
topped up. Check your owners manual.

not exact, to charge apropiate needs 10% more than nominal voltage. if not, will not charge the batteries.
And the charger its very important because you can over charge the battery.An example,if you have a 12 Amps Batteries each one if you put it in series will be 24 Volts.at parallel conection will be 12 volts but the double of Amps.
At serial connection will be 12 Volts the amps will be the same but the volts will be 24.

The charger at 12 Volts must be 13.8-14.5 DC Volts and divide the Amps in Hours.
The charger at 24 Volts must be 26-28 Volts. to charge well.

The charger for 12 amps batt example must charge 2 amps per hour at 6 hours = 12 Amps.(2 Amps Charger by 6 Hours Charging= 12 Amps.(Fully Charged.
3 Amperes Charger needs 4 Hours to charge 12 amps Batt.
5 Amperes Charger needs 2 Hours charging an a quarter
All of this is at DC Current.

Luck.

The charger which comes with the BPR40 is a rapid charger. (The book doesn't indicate if it is a 90 min. or 3 hour charger.) None-the-less, your battery is fine. When your charger is displaying green it will continue to trickle (slow) charge the battery to keep it topped off, so to speak. The first 3 charge cycles you should leave the battery on the charger the full recommended time. On most Motorola radios it is 10-12 hours. This will assure your battery is charged to full capacity and initiated properly. In most cases, your traditional charging of the radio should be overnight. When you go to bed, put the radio to bed on the charger.

FYI: All batteries come from the factory with some charge in them. It is a small test charge to assure the battery's funcationality.

If for some reason after the first week or so, you think your battery or charger is not functioning properly, contact the dealer where you purchased the unit. They can replace it under warranty.

Best regards.

Jo, nope you are safe. Most of the chargers are designed to cut off and go into trickle charge once they sense that the batteries are fully charged. The problem with overcharging comes after 18 hours or so. You should never leave the charger plugged into the chair for more than 24 hours. On the M51 the charger is built into the chair so just plug it in when you go to bed and unplug it when you get up and you'll be ok. You can check for full charge by looking at the charger there should be a red light and a green light when fully charged. Hope this helps

If the battery is completely dead a trickle charge won't do much. These are designed to keep a good battery good. You need a regular battery charger set to 10 amps for a couple hours then 2 amps overnight. Be aware that sometimes if your battery has been completely killed it may not work for long, that is your car will start but within a few days or hours it will leave you stranded. You'll know because it will drag when you try to start it. Sometimes you get lucky and it works great for years.

Next time do use a trickle charger! Also if the charge you use is automatic then you can leave it hooked up in 2 amp mode when you are gone. Good luck!

Some lights go out once charged...most chargers are with protect circuits so once the battery is fully charged the charger will either switch off or go into trickle mode...So e new battery manufacturers insist on 12-16 hours charge before first use....some batteries are already charged...you should check with a battery checker...but usually those that are precharged cost almost twice as the ones that are not.

Yes you can charge the 12 volt bttery on a trickle charger. You should use a 1 amp or less charger. Check the battery every 1/2 hour or so for heat. If it get's hot you should stop charging. Power packs that have a 12 volt rating will charge your battery safer and better but will take longer (like a cell phone charger) look at the voltage ratings on the charger. You will have to adapt the plug to hook it up and test for correct pos. and negative connections. The 7amp hour batery should be fully charged by a .5 amp (500ma) charger in about 14 hours (multiply the amps times hours of charge and do not go over the 7amp hours of the battery when deciding how long to charge). After charging check voltage, it should be around 12. Let the battery set for a few hours (overnight) and check the voltage again. It should be around 12 still. A fresh charge will usually show a higher reading (called a surface charge) than a battery sitting around. 4.5 v will not operate your device, 9.5 v or higher should.

On a Motorola charger, when the battery is charging the light should be a constant red (or amber depending on the charger). When the charge cycle is complete the light will change to solid green. Sometimes the solid green time is brief, as the battery will begin to lose charge, and the charger will go back into trickle mode and change once again to red (or amber). In most cases, a flashing light indicates a problem, such as a bad or shorted battery, an incorrectly seated battery, dirty battery contacts, or a bad connection with the battery. (Note: Batteries last 18-24 months typically. Check your date code for the age of the battery.)

There were several chargers made for the GP360, including but not limited to a 60-minute charger, a 90-minute charger, a 10-hour trickle charger and a 6-unit gang charger which would be a rapid rate, either 60- or 90- minute. If you would supply your charger's model number we could tell you which one you have.