Instruct: Classify Amazon reviews into positive or negative sentiment
Query: my own LZ310 Review

I had two LZ310 for over 2 years now. the design and concept were good. the light itself are bright and gentle. but my experience on the battery life is short of my expectation. I had to change the battery for 3 times in each lamp. they gave me the replacements at no extra charge. I wish they can improve the battery life. otherwise it is a good product.