Energizer 3LR12 4.5 V Max Battery

Product Information

Can be replaced with an AA cell using a plastic sabot (size adaptor), with proportional loss of capacity.

A rare battery, sometimes used in car security (car alarm/keyfob batteries), organizer (backup battery for PDA such as Psion etc. Many of these were sold as B batteries for early transistor radios (before their function was replaced by the 9-volt PP3 battery).Used in Skytronic PRO Audible Altimeter but also flow meters and organizers (as a memory backup battery).

Still popular for school science class use as a variable voltage supply as the current version has several taps at 1.This dry cell is commonly used in the UK for remote level crossing telephone handsets, where solar cells and rechargeable batteries have not been specified or retrofitted. Taller cells are assigned five-digit numbers, where the first two digits are the diameter in millimeters, followed by the last three digits indicating the height in tenths of millimeters. Commonly-used designation numbers indicate the physical dimensions of the cylindrical cell, as given in IEC standard 60086-1 for cylindrical primary cells.

The increased dimensions may mean the cell will no longer fit in battery compartments intended for cells without such circuitry. The Headway 38120HP cells are used in high discharge environments as they have very good continuous/peak discharge rates (10C/25C). In the following table, sizes are shown for the silver-oxide IEC number; types and capacity are identified as "(L)" for alkaline, "(M)" for mercury (no longer manufactured), and "(S)" for silver-oxide. Most sizes are uncommon today; however, the PP3 size (and to a lesser extent PP8, used in electric fencing, and PP9) is readily available. LiFePO4 properties: long lasting (2000+ cycles), safer, more stable, good continuous/peak discharge rates (3C/10C), less energy dense.Cells less than one centimeter in height are assigned four-digit numbers, where the first two digits are the diameter in millimeters, while the last two digits are the height in tenths of millimeters. A sealing tab keeps air out of the cell in storage; a few weeks after breaking the seal the electrolyte will dry out and the battery becomes unusable, regardless of use. In Switzerland as of 2008 [update], these batteries accounted for 6% of lithium camera battery sales.