just because canadian tire and walmart sell groceries doesn't mean I buy groceries from there.
Just because an airsoft store sells batteries and chargers doesn't meant I buy them there. ESPECIALLY when it comes to lipos.
Over discharging your lipos in the best case bricks them... worst case they swell up, release hydrogen and catch fire.
over charging your lipos without a balance charger in the best case results in FIRE because one cell has more volts than the other and aren't balanced, so you overheat one cell, it swells up, releases hydrogen and catches fire. If you're lucky it doesn't take your house.
do it right.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.