Watson NP-QM91 Lithium-Ion Battery Pack (7.4V, 4200mAh) Replacement for Sony NP-FM90, NP-FM91, NP-QM90, and NP-QM91 Batteries VIDEO POWER PROF-On Camera Batteries
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.
