Fish hawk has good customer service. Just call or email them about a malfunctioning TD. I thought my battery was dead after 4 years, they said send it in and they will replace it. However they said my battery was good but pressure sensor bad. Long story short, they shipped me new one for $50. Even if the unit is dead past the warranty, send it in plus $85 and you get a new one. (Better deal than $150). Fyi, the battery icon when you first power on reads reverse of what is normal. So an empty battery icon is good, shaded full icon is bad.