20 Most Recent Ryobi Multi-Volt Battery Charger - Page 6 Questions & Answers

i would check the output voltage of the charger with a volt ohm meter. if the charger output is ok then there is something about the batteries that won't let them take a charge. the batteries that you can work on is not really worth it. by the time you purchase the parts and if it works you don't save much money.

they dont fit at all

You have a defective battery

Fixya.com is a group of people who try to give people help with their questions about fixing things. The site you need for to get your parts is;
www.ryobitools.com I hope this helps.

red is charging, green is done, amber is either hot or bad battery ive seen that with both symptoms when on with the green. dont run your battery down to the limit and always keep the battery charged this will prolong the life of the battery, dont store dead batteries in other words.

ac imput to charger should be 120 v ac the charger should convert it to a dc voltage around the 4 volts

No. Not unless you also use the right size diode to make the AC go in one direction only.
AND---- Don't try anything like this with a Lithium battery! We're talking NiCad, right?

I had the same problem, my understanding was that since the batteries are nic-cad, they have a memory so in short you are supposed to charge the batteries only when they are depleted. They have to be COMPLETELY depleted the first 3 or 4 times of use. I ended up replacing the two I had, followed this and have not had any problems since. Hope it works for you.

Bert

Here's one that I found by googling "14.4 charger ryobi". There's more out there. Good luck!

http://www.amazon.com/Ryobi-1412001-14-4-Volt-Battery-Charger/dp/B002IKLOO6

talked to Ryobi and they are vague. It can either mean that the battery is bad, or the charger is bad and another one that maybe the contacts of the battery are dirty or not seating fully in charger. What I would look for in this instance first unplug the charger and look into charging slot to make sure the terminals of the charger are not bent and they come out into the cavity where battery would go. If not gently pull terminal into opening and retry. Sorry I couldn't be of more assistance

Here is the manual:
http://toolboyworld.com/eBay/Ryobi_P120/P120_566_eng.pdf

Red = quick charge
yellow = evaluating
green = charged

CHARGING A COOL BATTERY PACK
If battery pack is within normal temperature range, the red LED on charger will come on.

Red LED should remain on for approximately 1 hour then the green LED will come on. Green LED on indicates battery pack is fully charged and charger is in maintenance charge mode.

Yes you can.