(a) What are the routine maintenance carried out on lead acid batteries? (6)

(b) When a 10Ω resistor is connected across a battery, the current is measured to be 0.18A.

If similarly tested with a 25Ω resistor, the current is measured to be 0.08A. Find the e.m.f. of the battery and its internal resistance. Neglect the resistance of the ammeter used to measure the current. (10)