Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Polar A3 monitor is dependable

I've used my A3 for 4 years, works great and is very dependable. Wetting the chest strap helps with conductivity of the chest strap. The battery in the chest strap is replaceable if you send it to a Polar approved repair shop though I'm tempted to pry it out as it seems [...] bucks to replace it is a bit steep. Mine is still going strong after 4 years.