[CR] Nerf of fire extinguishers

A small fire extinguisher looks imbalanced: it's lighter than a big one (53g per charge vs 57g per charge), and 20 charges (=20 extinguished tiles) it's too big area for this small fire extinguisher.

Actually, the big fire extinguisher should be nefred too, because it can extinguish unreasonable huge area too.

current set:
4535g / 80 = 57 g per charge
1062g / 20 = 53 g per charge

suggested set:
big one:   60 charges, unchanged mass: 4535 g / 60 = 76 g per charge
small one: 12 charges, unchanged mass: 1062 g / 12 = 89 g per charge.

Balance:
Big fire extinguisher (better volume & weight "cost" per charge);
Small fire extinguisher (just compact item).

This is only my point of view, so any comments are welcome.