Instruct: Classify a review as either positive or negative.
Query: Battery life

Having worn a hole in the screen of my MS2-250 after 2 years, I found found that a replacement head was more expensive than a new MS2-370 so I ordered a new MSR-370 on sale for $19.95 plus shipping. The running time per charge was the 55min advertised for the 250 but I could only get 2 shaves at a total run time of less than 10 min out of the 370 which also has a run time advertised of 55min. To remedy the problem I switched the new head and blades off the 370 to the 250 and now again I have a decent razor. I don't understand these razors being sold with inferior batteries. If it's a case of you get what you pay for, then they shouldn't advertise 55min run time.