Magic Mouse: Eneloop Really More Cost Effective than Lithium?

Hi. Under heavy use, gaming or doing professional work for 16 hours a day at most is it really more environment friendly and cost effective to put Lithium disposable batteries like Everyready's Ultimate?
Supposing you used a calculated cost of having the Sanyo charger + four Sanyo Eneloops + trickle charge (although rechargeables can be charged many times which could last you decades. I think 80+ years. Having four Eneloops is realistic because, you need two extra Eneloops in the ready) vs. the Ultimate, how much would their cost be?
By the way, how long does Eneloop last if you use it heavily? The Lithium Ultimate performs so much better than alkaline (it's only at 94% after a month. The Advanced Alkaline was only at 3 weeks before it had to be replaced at 10% or risk having a leak if it's not replaced),
Gbu,
Alvin

For me, yes. Buying new batteries every few weeks got old. The eneloops are great and last about as long as the copper-tops I was using (which lasted about a month). I think I calculated saving money about the 5th month. B&H Photo has them for about $20.

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