How long do u charger a new batteriers - Ryobi Multi-Volt Battery Charger

Completely dead batteries may cause the charger to not see any load and it wont charge them. The way around this is to put the battery on the charger with the charger unplugged. Then plug in the charger and check the lights. Keep unplugging and plugging in the charger till it catches up and stays on.

See my previous answer.

first are you now using li batteries or nicad batteries
small chargers are battery composition specific
secondly-- chargers for aa /aaa batteries are cheap so get a new charger for the batteries in use

Ok, lets start slowly, do you have both a new battery and a new battery charger? If both attempt to use your old battery with the new charger. Also could be a bad charger or a shorted out battery...
Good Luck

Chargers and batteries are available on eBay

You need a new charger. If batteries where bad charger would still light.

new battery flashing red light means bad battery

If you have tried discharging the batteries prior to charging them already with no result and from what you describe in your post, then I would have to say the charger has issues. Go to HD or Lowes (not sure if Lowes carry Makita) but another charger and test your battery again. If you get the same fault, there is an issue other than the charger, if not you need a new charger anyway. If you get the same fault with the new charger, you can always return the new one. Short of opening up the charger and using a volt meter, this is the easiest way to test to pinpoint the real problem. I hope this helps and good luck!

if you have one check the battery and charger with a meter. if there both fine check the prong's on the battery and the power tool. if charger is'nt charging check the fuss in the charger.. good luck let me know.

When you say you can't cahrge it, do you mean on your PC, PS3 or with the charger? I don't think the PS3 charges the PSP, I have no idea about the PC, but if the PSP doesn't charge using it's charger, it is either the battery, the charger, or the psp charger outlet. If it is the battery, buy a new one. If it is the charger outlet, it is a good idea to have 2 working batteries and to buy an external charger at game crazy, game stop, or from sony. This way, you can switch out batteries while playing, like me :). If it is the charger, buy a new one.
I would suggest first trying to buy a new battery. If it works, you are good to go and your old battery was broken, otherwise your charger/ charger outlet is broken. Buy an external charger. Then, you will be able to charge the batteries while one is in the PSP.
A new battery and an external charger cost about $70, but it is worth it. I hope i helped.