Triade 250 Check Battery Error

[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