In November 2012, it was reported that in Lorestan 320 personnel organized in 18 platoons took part in exercises. Assuming these 18 platoons were the same size, this would translate to 17 soldiers per platoon. In 2013, during the Beit al-Moqdas exercises, imagery confirmed this number. However, during the same time, platoons with 20 soldiers were observed elsewhere.
Basic personal gear includes a four-color digital-pattern uniform, a rucksack, and webbing. Helmets, mostly steel, but occasionally kevlar, are sometimes worn; black and white scarves are common. Soldiers from Imam Hussein battalions appear to be generally better equipped(i.e. a greater prevalence of tactical gear) than those from Jerusalem battalions. In both cases, the kalashinikov-pattern rifle is the most common armament though each platoon has a small number (1-3) RPGs, SVDs, and/or PKMs.Equipment generally appears to be new-production.
Imam Hussein companies are reported, by Iranian media, to be 56-men strong. Imagery from the 2013 exercises shows Jerusalem-type companies with a strength in the high-50s. In another instance, an unknown type of company could be seen on parade with 54+3 personnel. Though the unit-type is unknown, the equipment is consistent the military-orientation of the two described here. A strength in the mid/high-50s would correspond to a composition of three rifle platoons, plus a company HQ. Little evidence exists of a weapons section held at the company-level. If it did exist, it would be the same weapon as those held by platoons (i.e. RPGs rather than ATGMs or mortars).
An undated photo shows what is purported to be an Imam Hussein battalion at a strength of 113 personnel, a number which includes their commander, a major. This corresponds exactly to a strength of two co/bn, though only when one assumes a complete absence of battalion staff or other support!
The 10th Imam Hussein Battalion from Mehriz in Yazd was seen during an exercise with a strength of ~97, which would also translate to roughly two slightly-understrength rifle co/bn. This number includes their commander, either a Lt. Col, or a Col.
Imagery from the 2013 exercise shows a Jerusalem battalion at eight-platoons strong, translating to an overall strength of ~136 personnel/bn. There may be an additional platoon out of view, indicating a traditional three co/bn organization, and a strength of ~153. It's worth noting that in the parade picture attached above, there are three distinct companies of the same type of unit, suggesting a three co/bn organization.
During this same exercise, in Saidabad, a number of platoons can be seen lined up, including at least three different sets of platoons, possibly corresponding to three different companies. Around 18 non-al-Zahra battalions are in view, though there may be more off camera. Of the platoons whose placards can be read, five 5th platoons can be identified, as can two 4th platoons, two third platoons, and one first platoon. This indicates at least five platoons per company, and the existence of at least three different companies. However, little can be discerned with certainty from these photos.