Hi Ed,
Yeah, I fell for the "gold" battery scam back in the iPhone 4 days. In general, Li-Ion batteries' capacities are limited by the physical size of the battery; unlike rechargeable technologies like Ni-Mh or Ni-Cad batteries, there haven't been any significant improvements in power density for Li-ion batteries; at least not enough to account for those gold battery claims.
@oldturkey03 did a great write-up on the subject that's worth a look.
The myth of the "high capacity" batteries - iFixit Repair Guide
So yeah, pretty much the only way to increase the capacity of a lithium ion battery is to increase the physical size. If it's the same size as another battery but claims like 50% more amperage, it's a lie.
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I returned my original MPF battery and was offered a replacement. The replacement arrived in an MPF box, that appeared to be used, but was in fact a Cameron Sino Lithium-Polymer battery. So far it is doing better than the MPF, but as good at the original Logitech (to the best of my recollection).
crwdns2934271:0crwdnd2934271:0 Ed Reeder crwdne2934271:0