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>Posted on 27 Feb 1995 at 14:38:08 by Wrolf Courtney >From: wrolf@ne*.co* (Wrolf Courtney) > >I have been using Ray-O-Vac Renewal alkaline rechargeables. I was going >through them very quickly until I found out that the internal chemistry >changes of renewable alkalines is minimized by recharging frequently >(the opposite of Ni-Cad batteries). Actually, NiCads shouldn't really care. If anything they too suffer internal damages during "deep" cycling. Usually though they are damaged by overcharging, too deep a discharge (reverse charging) and operation at elevated temperatures. >Now I recharge after every day of diving, and have good performance. The rechargeable alkalines should be recharged as often as possible as the more you discharge them the capacity they loose. NiCads don't loose their capacities irreversibly except when you fry the electrolyte during overcharge or reverse charge. >Anyone got numbers on resistance of UK mini-Q40 bulbs. I can guess: 4 cells, 5.3 Watts. That's about 5 Volts, 1 Amps, so that the hot resistance is about 5 ohms. The cold resistance is then about 0.5 ohms. Now remember that as the alkalines empty and the bulb dims the "halogen cycle" no longer recycles the particles that evaporates off the filament. >UK1200 bulbs; 7.x ohms hot, about 0.6 ohms cold. >AA no idea. >D alkali batteries? About 0.3 ohms/cell for Duracells "Copper Top". >Ni-Cads? The 4+ Ah variety measures in at 0.03 ohms /cell. The 1.2 Ah "C-cell in D-cell clothing" is higher. >Ray-O-Vac renewable alkalis? No idea. > john 015
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