Somewhere I read, that Panasonic is the only ones who make cells of 3.6 V, and 3400mAh. Larger doesn't exist. I mean, sure, the stores rate them at 3500, and even 3700mAh, but those batteries are very short lived.
Those panasonics come in at about $20 a pair, if I'm not mistaken.
The chinese ones at half the price. But they will last half as long
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