The Watson IA-BP85ST Lithium-Ion Battery Pack works with the same cameras as the Samsung IA-BP85ST. This replacement battery pack features a capacity of 800mAh and 7.4V of output power. Small and lightweight, lithium-ion batteries can be charged or discharged at any time without developing memory effects.
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These wouldn't hold a charge for any longer than an hour.
The original battery for my Samsung SC-HMX-20C video camera died years ago, so I decided to get two replacement batteries for the camera. The Watson IA-BP85ST battery was the replacement and it worked great. Both batteries charged up without any problems and I used the camera for about an hour of recording on each battery and the camera said I still had 30 minutes of life left in the battery. I'm very happy with the batteries.