If you are in need of Gold mount batteries, or are preferring to use V Lock batteries. This adapter let's any Gold battery mount take V lock batteries. This may be because there are no gold mount batteries available, or because you have v lock batteries much lighter than your gold mounts, so you get to use both. This adapter thankfully isn't too wide either. So as not to undercompensate for lighter batteries. Batteries that can mount to this adapter include: V-Lock battery ($19) - https://www.sharegrid.com/losangeles/l/79730?type=rent 2 V-Lock Batteries and Charger ($39) - https://www.sharegrid.com/losangeles/l/88250?type=rent 3 V-Lock Batteries and Charger ($49) - https://www.sharegrid.com/losangeles/l/79733?type=rent This battery adapter can be received by: Red Helium 8K ($279) - https://www.sharegrid.com/losangeles/l/126150?type=rent There is a p-tap out, so the other reason you may want this is simply for the ptap, if your gold mount or v lock batteries don't have ptap (such as red bricks) and you plan on using a gold mount adapter in the first place. There may be a subtle possibility where the current will be suddenly cut by the extra interlocution traveling through the original mount through the added battery adapter from the battery, to the camera. So when using this adapter, know that it was never meant to be as 100% fullproof as a straight mount.