For what it's worth mine has been faultless as long as I keep on top of battery changes and use, surprisingly, cheap ones. Rechargeable are a big no-no as they're 1. 2v, not 1. 5. I tried Duracell and Energiser, battery life was poor at just a few weeks. IKEA alkalines (£2. 50 for 10) last for months with 8-10 operations per day