One of my batteries is the same, it used to fire a couple of nails then flash red. Putting it onto the charger it would charge for a couple of seconds then turn off.
I thought it had blown a cell and re-celled it with new NIMH cells but it turns out it is the thermistor in the top of the battery that has failled (the silver rectangle in the top of the battery when you take the case off) this tells the charger to turn off when the pack gets hot.
You can probably get one from an electronics store and replace it, but my solution was to charge it from a Dewalt charger instead which uses a different cut off mechanism, just check the polarities on both the charger and hitachi pack BEFORE you connect up.
Hope this helps
Check your battery with a volt meter, also your charger may be bad
SOURCE: Can I use paslode roundrive nails in a Hitachi NR90GC Gas Nailer
Yes, BUT the paslode Round drive nails and known to cause driver jamms due to the excessive paper used in the spacing of the nails.
SOURCE: hitachi nail gun,piston/nail push rod
You have one or more worn o-rings in the head of the gun. They direct the air to the proper parts of the gun to first drive the nail then to return the driver to the top of the gun for the next nail. Depending on the manufacturer and your model number, some companies make kits to replace the o-rings (always replace all of them). For some companies you have to get a breakdown of the gun and order each o-ring seperately.
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