i used the 3m vhb tape.
its worked well for the years i've had the battery. the down side is now if i want to redo the battery, getting the tape off will probably do a bit of damage.
right now im rebalancing the battery, and i cant tear it down and hook it up in parallel to balance it easily. i have to charge each cell individual to balance them. so ... doable, but not as easy.
i built my battery follwing the will prowse website instructions... but it may have change by now, ...like i said this is a few years old...... i think i got the battery in 2017.
my lifepo bms reports i've run it 24 charge cycles in its lifetime.