The MacBook Pro 17" battery is a 68 watt/hour lithium-polymer module that's rated at up to 5.5 hours of performance, depending on settings and usage. That's a higher rating than the MacBook Pro 15's battery, to accommodate the larger screen. It's pretty durable but if you need to replace it, it's just a matter of switching out the old for the new. For longer life it's advisable to 'condition' your battery every now and then. See Apple for details.
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