Lemonzero

I have purchased Triade 250 two days ago and have been using Sony VTC6 Battery with the product. Last night, the product indicated that there was 60% of battery left, so I charged up my battery and put it back into the product. However, after putting the fully-charged battery back into the product, the product still indicated that the battery was at 60%. Therefore, please kindly advise me on how to solve this problem. Thank you