Question: what is the difference between d4 and d8 batteries?
Answer: As I see it, here are the pros of the D4: Smaller size, less weight, fewer batteries to buy and charge. D8 is that it's much brighter. The D4 uses two 5.8 watt lamps, while the D8 uses two 14 watt lamps. Both the D4 and D8 are rated at 7-10 hours of use, according to UK.