The CBP-N2 Compact Battery Pack from Bolt will boost the number of flashes and the recycle time of your compatible SB-900, SB-910, and SB-5000 flash. The CBP-N2 can operate on 4 or 8 AA batteries--alkaline, lithium, or nickel-hydride (Ni-MH). Lights on the pack indicate Standby, Recycle, or Low Power mode. A thermal protection switch prevents overheating. The CBP-N2 can provide up to 577 flashes per charge, and recycle times as fast as 1.92 seconds. The pack, which weighs just 7 oz without the batteries, can also be attached to the bottom of your camera using the tripod socket.

This Watson 4-Hour Rapid Charger comes with four 1.2V, 2300mAh AA NiMH batteries that are rechargeable up to 1000 times. The charger will recharge 4 of these included batteries in about 280 min, or 2 in about 140 min. You can also use it to charge optional AA NiCd batteries, or AAA NiMH or NiCd's. The charger's integrated micro-controller ensures that each battery is charged to its full capacity, and automatic charge cut-off prevents overcharging. Should the controller and automatic cut-off function both fail, the safety guard timer will kick in to ensure that the charger still shuts off after 6 hr. The charger also has circuit and polarity protection. Two LED indicators display charging status, and there are two individually-monitored charging channels. The charger has switching 100-240VAC power, enabling use all over the world. Its compact outlet prongs can fold in, making the unit more compact for storage.