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300mAh would be battery capacity, it actually says 300mA I assume? If so then yes a 4 hour charge would be to completely charge the battery. If you only partly discharge it there isn't really any sure fire way to tell unless you discharge the battery which can hurt it in the long run since its a NiMh. Best bet I suppose would be to not charge it and keep using it till its empty then leave it for 4 hours on that charger. (Discharging repetitively through normal use is less damaging then discharging with a discharger. Using a battery period is damaging thats why they only last so many cycles, its normal until mankind reaches absolute perfection which is impossible.)
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