Balancing Shield Cells in an unconventional way
I had a random thought earlier today, with all the talk recently about how 'overpowered' shield cell units are, and how many want them balanced. Instead of outright lowering their potency, why not give them some kind of unconventional drawback that makes you think before you use them. What if they literally were 'over-powered?' More specifically...
What if using them produced a large, very noticeable spike in heat?
Heat management is currently a mechanic that's a little underutilized in combat. Typically, heat doesn't even spike unless you're using weapons like PAC's, and while I wouldn't want this to become Mechwarrior-in-Space, I think this idea is logical.
Consider that your ship's capacitor holds enough power typically to recharge your shield to full, and yet slowly meters out this charge in a gradual manner, even if the System capacitor is completely full and the shield is nearly depleted. Perhaps the shield emitters are prone to overheating unless a limiter works to moderate the flow of shield stuff used to recharge the field around your vessel. Shield cell units bypass that by forcing a large amount of potential energy held in cells into your shield projector arrays, recharging them instantly and bypassing the limiter, at the cost of drastically increasing your ship's heat. Excessive use of the shield cell system can indeed spike heat enough to damage the vessel, and any usage is sufficient to make you a far easier target to resolve on sensors than you otherwise would be.
It adds an interesting dynamic to combat where you have to balance preventing the enemy's ability to harm you with the potential of harming yourself. In the very least, it might render yourself unable to use your more potent weapons until your ship cools down a bit. It also gives heatsink modules yet another use to consider. However, their limited ammunition and the need to use an internal slot AND utility slot brings the power level down slightly below what we've got now, even if using them in tandem.