Hi, I have a Ryoby charger number 1423701 but I

If the old charger has a deep-uncharge-protection contact and was also made for Li-ION ther is in any case a marketing technical design by a notch to protect the battery to place on the charger if this cells are not correct.
(this answer applies to all brands with a quality mark)

Contact Ryobi's customer Service contact directly off the Ryobi homepage and speak to them about the problems your having..and do it quickly, as rumor has it that Ryobi is getting out of the electric yard and tools machine business.

Two things come to mind (1) there is a short in the charger or (2) the light is simply out.

does the outlet work that the charger is plugged into... is the battery completely dead and the charger can't see it... is the charger even plugged in... or is it even any good ???

Bonjour comment peut on avoir une baterie pour un humer c est une baterie de 19.2V merci de votre reponce

Panasonic DMW-BCG10, DMW-BCG10E, DE-A39, DE-A11, DE-A25, PV-DAC14D desktop battery charger http://www.panasonic-battery-charger.co.uk/

If it's not charging and your batteries are still good then more than likely the unit is shot. You can try cleaning the contacts on the unit and your batteries and see if that helps.If you know someone with a universal charger try your batteries on that to make sure it's not them that's the problem. Check ebay for a used one at a cheap price. This is not a fix you can do unless your a techie and it's not worth sending off to Ryobi for a factory fix. i just replaced my panasonic charger for the same reason, but i had it for 10 years.

http://oneworld1.inetu.net/manuals/ryobi/hp1442m_1802m_874_eng.pdf
It sounds like your battery is bad. If yellow and green are on for more than 15 minutes it probably a defective battery pack. See page 8 in the manual.

hi friend,

it may the battery prob in your laptop. The battery life is maximum one year or two year in most of the laptop . You must check the battery in the show rooms or any other service centers.thanks

bye