AGK Electrics 2

• Converts chemical energy to DC electrical energy
• Used in case of generator failure
• Voltage of lead acid battery fully charged is 2.2 V
• Capacity of a battery is the amount of amps that a fully charged battery can supply.
• Test to assess state of charge by comparing on load and off load battery volts.

• Made of lead peroxide & lead
• Electrolyte 30% sulphuric acid & 70% distilled water
• Can be charged using generator/alternator (source with a higher EMF)
• In storage, can be held on 'trickle' charge

+Lighter & more robust

+Sturdiness owing to it's metal casing

+Good storage capability + longer life

+Wider permissable temp range

- More expensive

- Lower voltage per cell

- Prone to thermal runaway

• +ve plates nickel hydroxide -ve plates cadmium hydroxide
• Electrolyte 70% distilled water 30% potassium hydroxide

Overcharging problem caausing electrolyte to boil, violent gassing, meltdown of plates and possible explosion.

Avoided by

• keeping charge rates within limits
• monitoring battery temp