Irritatingly, battery capacity is only shown on the battery itself and not in the deviceís battery info. So, is it really 2430mah? Donít know. But there IS a difference. The 1530mah stock battery ran out of juice alarmingly quickly Ė like falling off a cliff - when at 30-40%, yet ĎBusiness Batteryí allows heavy use (downloads, browsing, videoÖ etc) right down to single digits. So now I can use Streak much more (Iíd say several hours more of constant use) when battery level is below 50% without worrying if itís going to suddenly die on me. No gain between 100-50%, though.
I was prepared to slag this off, but from my experience itís genuinely longer-lasting, especially at low battery levels. How long the battery itself will last only time will tell.
Iím not prepared to test it against Mugenís 1800mah and spend near 30 quid (plus £18 p&p) in the process.