Why be under-powered? 8.4 volts is the standard. You cant really hurt anything by going lower, but dont expect anything to shoot for as long.

Do you also have a multimeter to allow you to know with 100% certainly that your batteries are charged, and discharged, at the right rate?

Is over $600 of gun and equipment worth depending on a $35 charger to ensure your only source of power is in perfect shape? That is entirely up to you.

Honestly a proper battery charger is probably the best investment in airsoft. All your upgrades, accesories, multiple sets of camo, etc, are useless if you can't care for your batteries. If there's one thing I wouldn't spare expense on it's the charger. And for no more then about $120 at a local hobby store you're looking at something that'll do almost anything you'd need and give you the displays you'll want.

You people ar very help full. I wil lbe going to my local hobby shop to look around for one. Thanks