I've gone through 2 cordless Wahl beard trimmers in about 10 years. First one I fried when I plugged it in a 220 in Europe after about 5 years. The other has lost its umpf and has started to pull and be uncomfortable. What do you use to maintain your beard level and form? I typically level my round beard once a week with the Wahl to keep it trim and close to the face. Is the lifespan of 5 years normal for either blades or battery to go?