@d3vy Perhaps. I expect them to last long enough so that cost per charge over the life of the battery is significantly lower than disposable batteries. That's probably not happened with some of them I bought whereas the Uniross ones work out at fractions of a penny per charge. IIRC the Maplin ones worked out at about £1.25-£1.50 each to buy whereas you can get 30 branded AA batteries in one of the DIY sheds for less than £9 (and probably cheaper elsewhere). While I respect your attempts to avoid disposable batteries, considering your lossy use case you'd probably be better off with the disposable ones in the kiddie toys?