If “low self-discharging” batteries are not important to you, these Tenergy Rechargeable D size batteries are a Ni-MH battery that offer a long running life and high capacity of 10,000 mAh. According to , these batteries can be recharged up to 1,000 times. They can be recharged via a smart charger or universal charger. A standard charge takes 15 hours at 800 mA or they can be rapid charged in 3 hours at 4,000 mA.
The ultimate professional battery charger by Maha/PowerEx has been designed for the high capacity C and D batteries. Charging time for an 11,000 mAh D size battery is around just 5 hours. You can charge any combination of AAA, AA, C, or D batteries at the same time with up to 8 stations. Each battery is individually monitored via an LCD display to show charging status.
Sensing when the battery has reached a full charge, it will shut off or switch to a standby battery. It can also detect when a battery has reached the end of it’s life. Powered by an AC 110v-240v adapter, this charger can recharge a D size battery of 1200 mAh to 10,000 mAh in 3-10.5 hours.
Another selection from , this universal charger can recharge a combination of 1 to 4 AAA, AA, C, or D sized Ni-MH batteries and 1 to 2 9V Ni-MH batteries. For a D size battery of around 9,000 mAh, the charging time will take about 7.5 hours. The blue LCD display shows individual battery status: charge, discharge, full, and bad.