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Open-circuits 86 Open-circuits. Caused by acid on soldered joints 86 Open-circuits. Caused by broken terminals 86 Open-circuits. Caused by poor lead burning 86 Opening batteries. Equipment needed in 97 Opening batteries. Heating sealing compound 332 Opening batteries. Instructions for 328 Opening batteries. Pulling elements out of jars 333 Opening batteries. Removing connectors and terminals 329 Opening batteries. Removing post-seal 331 Opening batteries. Scraping compound from covers 334 Opening batteries. When necessary 326 Opening batteries. When unnecessary 325 Operating conditions. Effect of, on capacity 44 Overdischarge causes sulphation 69 Oxides used for plate pastes 11 Oxygen and acetylene lead burning outfit 143 Oxygen and hydrogen lead burning outfit 146 Oxygen and illuminating gas lead burning outfit 146