I just picked up the new 2800mAh Pro Tek Battery and it's quite a bit lighter than my 4400 and 4600 SMC packs. The 4400 and 4600 actually both weigh in at 211grams and the 2800 is about 180, I need to double check again. Should take most cars down under the legal limit pretty easily. I'll be testing this pack soon and I"ll report back. So far first couple of cycles on my iCharger 308 I'm seeing at least 2800mAh and around 3.0mOhms average between the two cells in the pack for IR. I have a feeling when the pack has a few runs through it it will go down a bit. My SMC packs typically have a 2.5mOhm IR rating.