If i use lipo do i have to run the battery all the way down not below the cutof just for example if the battery lasts 20 minutes (safe to were it hits the 20th minute at the cutoff) and i run it for ten what happens next. after i unplug it can i charge it or do i have to wait and run the other ten minutes out of it later. the quark 125b has a build in low voltavge cutoff right.

Overdischarging damages Li-Po's. Extreme over discharging can lead to a "puffed" pack or worse. That is why the LVC (low voltage cut-off) nneds to be activated on the esc.

i know but what do i do if i ran the battery half down do i run the other half down or can i charge the battery even thought it still has half left.

is the activation of the lvc in the quark come already there on the lipo setting or will i have to program it in.

driving packs half empty and then charging again is ok.
and yes you'll have to program the lvc.:027:

will it mes up the batt. or do i just stick it on the charger

charge it full again, better leave it with full charge

so it is safe to charge it when it is not all the way dead but is still usable like half charge. correct.