Skil PWRCORE 20 BY519701 Guide D'utilisation page 6

Do not let gasoline, oils, petroleum-based products, etc . come
in contact with plastic parts . They contain chemicals that can
damage, weaken or destroy plastic.
Do not touch the uninsulated portion of output connector or
uninsulated battery terminal . There is a risk of electric shock.
Replace battery pack if a substantial drop in operating time per
charge is observed . Battery pack may be nearing the end of its
life.
6