did you spot weld the batteries or use a vruzend/NESE style kit? based on all the components you mentioned you basically built a meepo/wowgo board with better hub motors as theirs are 250w x 2 …500w total where as you have 1000w total.
now lets talk about output… a 1p battery based on those cells is gonna suck… im not spending time researching these cells but im gonna assume they can output 10amps continuous as that would be minimum standard for small packs.
the esc can probably max out at 50amps input. and the 10s5p could probably do 50amps output if the bms allowed but probably is set at 40amp.
lets get to numbers… amps x volts = watts basically… so that crappy 1p at 10a x 40v max = 500w total… spread over 2 hubs each could receive 250 max watts (someone correct me if im wrong.)
so your half way there… i dont know if the esc has any max watt settings but assuming not…and if you could pump the 50a continuous that would be like 2000w total… i think…
honestly you should be fine… i have the same hubs i used to upgrade my meepo… and no issue… most main demand will be on acceleration then levels drop as you just maintain speed.
to answer the question if linking both 1p batteries in parallel with separate BMSs yes that will work but why?? kind of waste of good space for the parallel connector and extra bms.
just make a 2p and call it a day. a 1p will have shit range and even if your only going a mile who wants a battery “good enough” to get the job done. have the extra juice for extra errands, carving, fun, or even a long mile of aggressive riding with minimal sag.
if it were me id just keep the 5p battery installed and in a few weeks of carrying it around your muscles will grow and it wont feel so heavy any more…but nothing less than a 2p