Talk:Swim Charge Fins/@comment-162.225.60.197-20160520114655/@comment-219.74.5.142-20160525150110

Had the same problem, and found the answer to this: the fins only charge held devices when your swim speed is above a certain rate. If you have too many tanks in your inventory, you get slowed down too much to charge anything. However, using the seaglide will still result in charging due to its speed not being affected by your tanks.

So how many tanks is too many? I experimented, and found the fins are useless if you exceed:

1 HC tank + 1 normal tank

1 HC tank + 5 Plasteel tanks

1 Normal tank + 6 Plasteel tanks

2 Normal + 2 Plasteel tanks

9 Plasteel tanks

Even if you add one plasteel tank over these limits, your fins stop charging.