I am using these straps to hold a heavy (around 13 lbs) battery to my electric bike. For this task I use 3 straps and they work, but required re-tightening after a day because they stretched a small amount. Most of the straps worked fine, but when putting on the third strap, the thermal weld holding the head onto the strap broke. On the other two, the the thermal weld seems to be holding up fine.If using the straps for high-load or critical applications, I would suggest cutting the thermal welded portion off and stitching them securely together using plenty of heavy-duty thread and possibly glue or silicone for neatness and additional reinforcement.A downside of these types of straps in general is that securing loads between 18 and 19 inches in circumference is difficult. One strap is barely too short, and two straps are barely too long.
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