On the subject on POWER!

[willcaddy]

Worth reading through the FRA rules for guidance on fuse rating
The fuse rating is set by the discharge current of the batteries. You need to understand that and rate the fuse under it

e.g. (from wiki but google does the job)

For a 2000 mAh battery with a 15C rating, the continuous current that may be drawn out of the battery is 2000 mAh x 15 = 30000 mA, or 30 Amps (A) (divide by 1000).

Also worth mentioning that the fuse should be rated below the burst current, not continuous. So if the above 15C pack had a burst rating of 45C, then the fuse would have to be rated below 90A (45C x 2.0Ah)

Thank you both! This is really helpful

Thank-You all for taking the time to help!

Will