Has anyone had any issues using their phones, tablets on the Ukrainian electrical system? I regularly charge my phone using a European/British adaptor and have had no problems. However, some items that I have bought for gifts (phone, smartwatch etc) seem to develop charging problems over time, either with batteries burning out or the charging system going kaput. I know the voltage is 220 in Ukraine so it is weaker than the British 240v so I can't see a problem with overcharging.