Rechargeable flashlight obsoletes lantern battery.(design ideas)

EDN, December, 2003 by Huffart, Fran

THIS DESIGN IDEA describes a high-intensity, rechargeable flashlight system that you can build from a 6V lantern-type flashlight. The rechargeable battery comprises four 2V, 2.5-Ahr (ampere-hour) SEA (sealed lead-acid) cells, similar in size to a standard D-sized battery. SLA cells are especially well-suited to powering flashlights because of their low sell-discharge rate. NiCd (nickel-cadmium) or NiMH (nickel-metal-hydride) cells can lose as much as 1% of their charge per day, compared with less than 0.2% per day for SLA cells. SEA cells are also easy to charge and can withstand abuse. The flashlight in this design uses a krypton high-intensity lamp. Maglite (www. maglite.com) makes this lamp as a replacement lamp for its line of flashlights. The lamps are extremely...

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