I often see vapers discussing their choice for the best batteries for a regulated mod or the best “mech battery”. But are the best choices for each of these categories of mods actually any different? Does each need something different from a battery? Let’s assume that only batteries with high enough current ratings for the way you vape are being discussed. Vapers typically look for the highest capacity battery they can find for their regulated mods, not the “hard hitters” (that have the least voltage sag) that mech users often favor. But a high capacity battery that has a lot of voltage sag will drop down to a regulated mod’s battery cutoff voltage (typically near 3.2V) faster than a battery with less voltage sag. So a regulated mod could benefit from using a battery that “hits hard” and holds its voltage up for longer too. Unregulated and mech mod owners often look for the battery that hits the hardest, to get the most power to their coils, but they also want the battery to run as long as possible. This typically means a higher capacity battery. So, regulated mod users can benefit from using a hard-hitting, long-running battery and unregulated/mech mod users can benefit from using a hard-hitting, long-running battery. Hmm....maybe both types of mods, regulated and unregulated/mech, need the same thing! Batteries that have less voltage sag and that also have a long running time can address the needs of any type of vaping style and mod. They’re the best overall performers. This would include the Sony VTC5A, Molicel P26A, Molicel INR20700A, Sanyo NCR2070C, Molicel P42A, Samsung 30T and 40T, and others. But there are always users who are at the opposite ends of the power range that can benefit from using certain batteries. Low power vapers might be able to take advantage of ultra-high capacity (but low current-rated) batteries like the Sanyo NCR18650GA or Samsung 50E2. High power regulated mod vapers might not be able to get any decent vaping time before low battery alerts pop up unless they use something like the Samsung 20S or Samsung 30T. High power unregulated/mech vapers also have short vaping time problems due to huge voltage sag so batteries like the Samsung 20S or Samsung 30T can help them too. These are not the only batteries to consider! It’s just a short list of a few that can help when deciding what batteries to buy. There are others that are also good choices. My Recommended Batteries tables have a few: Mooch's Recommended Batteries | E-Cigarette Forum So while there can be some differences in what batteries might be best for very high or low power regulated mod users and unregulated/mech mod users there is a lot of overlap in the batteries recommended for each. Kind of makes sense though, a great performing battery doesn’t care where it’s used.