In summary, what I've heard/experienced:
Batt 4000 - Junk stay away
IB4200- Superfast, but unreliable
Gp4300- Fast and reliable, but performance begins to drop off after a few charges
Gp3700- Fairly fast, super reliable, but very hard to find for sale.
Ep4200- (Firecracker) Not many around, but supposedly fast and reliable.
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