It was possible before, I had used it until last year! But earlier this year I checked in with some 240 JPY left and found out that I couldn't charge it during

It was possible before, I had used it until last year! But earlier this year I checked in with some 240 JPY left and found out that I couldn't charge it during the trip... Luckily it was enough for the 2 stations in the Osaka Metro to save me an awkward moment.