Losi LOSB0102 - Manual (Page 5)

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If you are going to be using a charger other than a peak
detection charger it is important to have your battery fully
discharged prior to recharging. Many of these have a 15-20
minute timer that allows you to set to the amount of charge
time. If the battery was not fully discharged from prior use, you
can potentially over charge your battery pack.
Do not charge any battery unattended, and monitor for
heat build up. If the battery pack is more than warm to the
touch immediately discontinue charging.
Read all safety precautions supplied by the charger
manufacture, and also any from the battery manufacture.