BONAI Rechargeable D Batteries, 10,000mAh High Capacity 1.2V Ni-MH Battery Cell, Long-Lasting Power for Baby Swings, Flashlights & Toys, Pre-Charged & Low Self-Discharge (Size D, 4 Pack)

Customers find these rechargeable batteries to be of good quality and consider them a great value for money. However, the battery life receives mixed feedback - while some report they last all week, others mention they only get a 50% charge. Moreover, reliability is also mixed, with some saying they work OK while others report the charger showing an "error" message.