Yes have can say that the G1X MK2're not so compact it and that it is not light either, but it set aside remains unt great camera. Side grip compared to a Sony DSC RX100 MK3 is not comparable. Side battery, other than canon brands are well hidden and do not appear in seeking only NB-12L, I have found in Canon G1X looking mark ii NB-12L, and there, the batteries are sold by or with 1 or 2 without charger (Patona, 3.6V / 1800mAh, for example) and cheaper than the gun battery (displayed on the date of the post in the 80).
Other accessories are also findable other than those of canon origins (except perhaps the flash), such as the sun or from the filter adapter.
