We started this week by showing you some photos of the Seidio Innocell Super Extended Life battery for the HTC EVO 3D, so it's only appropriate that we end it by telling you about the capacity and price, two important bits of info that were previously unknown.
The battery is expected to become available next week in two varieties: 3400mAh for $69.95 and 4000mAh for $74.95. They appear to be the same physical size, as the replacement battery door looks identical for both, which means the 4000mAh is clearly the better buy. Unless it is physically thicker, paying an extra $5 for an additional 600mAh is a bit of a no brainer.
If you decide to preorder one of these batteries, you should know that there can sometimes be a significant discrepancy between stated and actual capacity (see BatteryBoss for more on this). Some people may not care about the missing capacity if they can use their phone exactly how they want to for a full day (or two), but others obviously want to get exactly what they pay for.
Any takers?[Seidio 3400mAh | Seidio 4000mAh]