🔍 Key Concepts

• Nickel-cadmium (Ni-Cd) vs. lead-acid battery construction and chemistry • Energy density and weight/space requirements • Typical maintenance and cost characteristics of Ni-Cd batteries on vessels

💭 Think About

• Which type of battery usually gives more power for the same physical size and weight? • On a vessel where space and weight are limited, which design advantage would be most valuable? • Do higher performance batteries on ships usually cost more or less than traditional ones?

✅ Before You Answer

• Compare number of cells needed in series for a given voltage between Ni-Cd and lead-acid systems • Think about space/weight savings and whether that is a known benefit of Ni-Cd batteries • Consider whether "no maintenance" or "less costly" sound realistic for Ni-Cd batteries used in marine service