Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good initial performance, poor after less than a year

I purchased one of these eFilm/Delkin batteries in April 2005 (not from Amazon) as a replacement for the original NB-1L that came with my Canon S230.While it initally performed just fine, after less than a year of use it has degraded to the point where I get perhaps 40-50 shots on a single charge (screen on all the time, mixed use of flash). This is poor performance from a Li-Ion battery that's less than a year old, especially as the original 3 year-old Canon battery now has roughly the same performance.OK, so it was cheap to buy, but now I'm looking for a replacement less than a year later - the original price doesn't look so cheap any more.Overall, you're probably best avoiding this one.