Has anybody bought these rebuilt NR batteries? I've seen several different places that offer to rebuild the water-bottle battery.

Is there much difference between the 5.0/5000mAH or the 2.1/2100mAH "c" size replacements that they are offering?

These guys are charging between $50.00 and $100.00 to rebuild a battery. This sounds a bit expensive, unless the finished product is BETTER than the original.

Anybody have any ideas???