I emailed Sony and they said that they only recommended the NP-FP30."We can neither recommend or endorse any third-party products. To use any other products may cause unforeseen complications or damage and could negatively affect the product's performance. Damage caused by the use of any third-party products is not covered under your warranty." But Sony lists the NP-FP50, NP-FP-70, and NP-FP90 on their battery chart as compatible with the HC21 - this chart doesn't even list the NP-FP30. I have a question emailed to Sony regarding this...as who knows what to buy?
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