The banding is needed if the cell voltage accidentally goes over 4volts or under 2volts. this will case the electrolyte to heat, soften the plastic cases and the gas from the overheated electrolyte will balloon the cases. The capacity and function of each cell relys on the thin plates inside being held very close together so if the cell balloons this close contact is lost
and so is the capacity. Warming the case and crushing it flat again restores most of the capacity as long as the over heat was for a short period so very little electrolyte was lost
For this reason regulated voltage control and monitoring is essential, keep any cell below 3.6v and above 2.8v so set the charging voltages and load disconnect with these in mind. i highly recommend monitoring individual cell voltages, a $28 Junsi cell logger from a hobby store is idea for this job, set the alarm
voltage to the figures suggested above and you will have a warning if something goes outside those perameters, there is an external alarm
port so a quick wire up across the test botton of a smoke alarm makes an excellent clearly audable alarm that you just can't miss within a 100 mtrs or so.
So, all you suggest looks fine and correct, band the batteries with rigid end plates, a cell logger and alarm and you will be right for many years, no one has killed one yet if they have stayed inside those perameters and as long as you don't wander too far or for too long otside those perameters they servive so they are fairly robust units.
For what you need one of these may suit 12V LFP
I haven't used this chemical combination but a few others here have in bigger battery banks, it's already packaged so all you would need to add is the Junsi cell logger and wiring
, the wiring
plugs are available from E Bay but I see EV Power that sell the above battery also stock the loggers so I'm assuming they would also sell the plug
and fly leads.
Absolutely no connection with this company, haven't even bought anything from them but someone on another forum mentioned them so I thought I'd pass it on.
I have no idea about their cycle life, lots of confussing data but the factory claim is 2,000 cycles to 80% DoD I think.