Tesla expected to report weaker sales as competitor BYD breaks records 

The company's older lineup of vehicles is having a harder time keeping up with fresher offerings from rival electric car manufacturers

Tesla is expected to report a drop in quarterly sales on Tuesday as the slowdown in the electric car market continues. 

Electric car-maker Tesla is expected to report another quarter of weaker sales as its main Chinese competitor BYD sees a record number of units sold.

Analysts are estimating Tesla will report on Tuesday it handed more than 441,019 new vehicles between April and June — a drop of 5.4% compared to the same period last year. This would mark the second quarterly decline in a row for the company.