bad quality accessories..
IMHO I must disagree with that comment. Mugen accessories are nice but a little bit expensive. If I want cheap crap there are plenty on eBay that announce lots of mAh but when you test them correctly you see that it's false advertising. Bought a "Li-Polymer" battery there with 2430mAh announced and it almost couldn't reach 1700mAh! Of course that eBay has interesting stuff too and I buy there some times.
I already had a Mugen slim (normal) high capacity battery on a HTC Desire (original) and it definitely was worth the money. Almost 35% more capacity without changing the cover. :good:
Recently I had a HTC Wildfire S and bought a Mugen dock/desktop stand for the phone with a compartment for charging an extra battery at the same time. Excellent build quality, fast charge times (on the phone and on the compartment) and as a "bonus" it came with a USB pass-through port for PC connection. Nothing to complain about.
Maybe some of us didn't have luck with Mugen but that's no reason to generalize.