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Home > Reviews > Camcorders > NP-QM91

NP-QM91 Info-Lithium M Series Battery Review
1/20/2003 - Updated 3/21/2005

A look at the battery
 
  NP-FM50
on the left
 
This is a 7.2V 4140 mAh rechargable lithium ion battery. It is large, 1.5" x 2.4" x 2.2" (38mm x 60mm x 56mm), and heavy at 8 oz, or 227 grams. The NP-FM50, by comparison, is a 1180 mAh battery, 1.5" x 0.8" x 2.2" (38mm x 20mm x 56mm), and weighs 2.7 oz (76g). In other words, the NP-QM91 is three time the size and weight of the NP-FM50 with 3 1/2 times more recording time.

The information given by Sony is that the NP-QM91 will provide up to 380 mins continuous recording time. Obviously, that depends on the usage.

Using the NP-QM91 on Sony's DCR-PC101
This battery will run all day on a PC101. It seem to double the size and triple the weight of the camcorder. Using only the viewfinder, I've been able to record to 5 complete 60 minute tapes, with time to record to another tape. That's about 6 hours of recording. It is a definite overkill on a compact camcorder, but when you're taping all day, you won't have to be reminded of swapping batteries.

With Sony's DCR-TRV950
For some reason, my TRV950 sucks up battery life. When using the viewfinder only, the NP-QM91 will last through three 60 minute tapes. When using the LCD, the NP-QM91 will allow me to record to two 60 minute tapes (almost). Although it appears that I may have a problem with my camcorder, communicating to other TRV950 owners reveals that, I'm not the only one experiencing shorter battery life.
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