“Well, we can make a new power pack. We’re going to have to eventually duplicate that phone and rip it apart to get the battery out anyway. Then we can keep duplicating the battery, and make banks of them. Putting a bunch in parallel would be equivalent to making one that lasts longer, but we’ll also need sets in series for higher output levels for some of the things I want to make. Combine series and parallel to make power packs for higher voltages that still last longer. Those are going to be our primary sources of power, though we’ll need to make charge limiters for each one, so we can recharge them safely off our little bench generator. Lithium-ion batteries like those tend to set themselves on fire if you’re not careful.”