Unfortunately unless you have a multi meter, and know how to use it you are going to struggle to see which item has failed, what I would do is check the voltage from both battery and charger to see which is not correct.
So back to basics, is the battery properly inserted into the charger? if there is a stand by light on the charger, is this on? is the fuse in the plug ok? ( swap with a fuse you know is good ) is the plug socket you are trying it on live?
SOURCE: Forfex trimmer FX766 won't charge
Angehair,
It is most likely the battery, don't even try to open the case if you don't know what you are doing, Forfex will not replace the batteries in these small trimmers as they state it is too labor intensive, I am working on obtaining batteries for these units.
They have to be soldered in.
SOURCE: Ryobi 18V lithium battery won't charge
Hi, Thanks for getting back to me. The yellow and blinking red indicate a defective cell. Since it has lithium cells and is that new any repair to it would be a waste of your time. Ryobi tools purchased in 2008 have a 2 year warranty. I am guessing you probably got it at a home depot and you should return it under the warranty. All new Ryobi tools have a three year warranty. Good Luck! and Thanks for using fixya!
SOURCE: there is no air filter on my Ryobi c430 grass
I had a number of customers tell me that they bought this model at LOwes and had the same answer from them. I think its a planned failure on Ryobi's part. Their reply to me was that they dont need one because they work in a clean environment. I find this to be a stupid answer, I would recommend that you buy an airfilter for an older model that used the donut foam filter and slice it in half to fit in the housing without crushing it and imbeding the air flow, this will help tremendously. Good luck. MY advice from 44 years as a small engine engineer is to buy a name brand product from a company that stands behind them, and never sells them in a box..
SOURCE: One of my Ryobi 18v battery packs (1400672) won't charge.
Use
AC / DC Power Adapter Replaces Ryobi One+ Batteryhttp://lcdpayless.com/ryobi_one_power_adapter.php
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