Rechargeable: Difference between revisions
→Lithium Manganese (LiMn2O4) 3.7V/cell: add bestinone as a source of IMR cells
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(→Lithium Manganese (LiMn2O4) 3.7V/cell: add bestinone as a source of IMR cells) |
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===Lithium Manganese (LiMn<sub>2</sub>O<sub>4</sub>) 3.7V/cell=== | ===Lithium Manganese (LiMn<sub>2</sub>O<sub>4</sub>) 3.7V/cell=== | ||
These cells allow higher drain (5C) than li-ion cells without some of the dangers. AW sells these as IMR (supposedly based on "LMR" for lithium manganese rechargeable, but the lower case "L" was mistaken for an "I" and never corrected), and Sony as Konion. They can be charged in most li-ion chargers, but some li-ion chargers will overcharge LiMn cells. LiMn cells should be charged at 1C to 2C. Due to lower overall capacity, these batteries fill a niche with flashlights demanding very high current where runtime isn't that important. While they are safer than lithium-ion cells, they can still be made to explode if provoked sufficiently, unlike the LiFePO<sub>4</sub> cells which cannot. | These cells allow higher drain (5C) than li-ion cells without some of the dangers. AW sells these as IMR (supposedly based on "LMR" for lithium manganese rechargeable, but the lower case "L" was mistaken for an "I" and never corrected), and Sony as Konion. They can be charged in most li-ion chargers, but some li-ion chargers will overcharge LiMn cells. LiMn cells should be charged at 1C to 2C. Due to lower overall capacity, these batteries fill a niche with flashlights demanding very high current where runtime isn't that important. While they are safer than lithium-ion cells, they can still be made to explode if provoked sufficiently, unlike the LiFePO<sub>4</sub> cells which cannot. As an alternative to AW or Sony cells, [http://www.bestinone.net/index.php?route=product/search&keyword=imr&category_id=36 bestinone.com] has generic IMR cells in a number of sizes. | ||
=== Sealed Lead-Acid (SLA) - 2.0V/cell=== | === Sealed Lead-Acid (SLA) - 2.0V/cell=== | ||
A classic rechargeable battery where cells are hooked up in series to generate higher voltages. A 6V battery would have 3 cells and a 12V would have 6. They are sometimes used in [[Terminology#HID|HID]] lights, but not for more portable lights due to poor size/weight characteristics. However, SLA batteries are very reliable if kept topped up, cheap, and as such, often still used in cars, if not torches. | A classic rechargeable battery where cells are hooked up in series to generate higher voltages. A 6V battery would have 3 cells and a 12V would have 6. They are sometimes used in [[Terminology#HID|HID]] lights, but not for more portable lights due to poor size/weight characteristics. However, SLA batteries are very reliable if kept topped up, cheap, and as such, often still used in cars, if not torches. | ||