Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Don't waste your money

This BR50 battery is worthless junk. On the same day, I ordered 2 batteries from 2 different Amazon vendors. The BX40 cost me less than $4.00 shipped and I got it in less than 1 week. It holds a charge for 3+ days depending on the usage. The BR50 cost almost $7.00, took almost 1 month to receive (slow boat from China I guess) and holds a charge for less than 8 hours.