Απάντηση: μπαταριες-φορτιστες
Oι μπαταριες IMR τι διαφορα εχουν απο τις απλες rcr123?4.2v cr123a δεν βρηκα πουθενα,που αγοραζετε εσεις?
LiMnO2 / LiMn2O4 / "IMR" / LiNiMnCoO2 [various Lithium Manganese Oxide type cells]:
General Information:
3.6-3.8V cells ordinarily found in Power tools. These cells have found their way into flashlight applications for various reasons. Their properties are similar to LiCoO2 cells in many ways, but with a few key differences. These cells are not available with protection circuits on individual cells, but are considered "safe" chemistry cells, similar in safety to a LiFePO4 or NIMH cell.
Advantages:
Excellent balance of energy density and power density. Capable of driving loads that LiCoO2 cells can not safely handle. Safe chemistry means they will not fuel their own fire in the event of a catastrophic failure with oxygen.
Disadvantages:
Lower Energy Density than LiCoO2 cells.
Charging:
Charging requirements are basically the same as most LiCoO2 cells, 4.20V termination for most LiMnO2 cells is common. There are a few LiMnO2 chemistry cells found in power tools that need to have their charge terminated at 4.10V rather than 4.20V, but at the time of writing this, the only "consumer oriented" loose cells available are from AW, and they will charge fine in MOST 3.7V li-ion chargers. Over-charging will dramatically reduce cycle life and severe over-charging could cause the cell to "pop." These cells can usually handle faster charging rates than LiCoO2 cells, check the specifications on your specific cells for more clarity on this issue.
Discharging:
The minimum discharge voltage and maximum recommended discharge rates, continuous and pulse, vary by manufacture. Generally speaking these cells can handle very aggressive discharge rates without much trouble, 5-10C range is common for the upper end limit. Discharge should be terminated at ~2.5-3V under a load, shallow discharges are healthier for these cells just like for LiCoO2 cells.
Safety Concerns:
Nothing too serious, similar to NIMH/NiCD/LiFePO4 safety concerns. When overheated or overcharged or repeatedly abused they could pop and/or vent gas. Ignition is unlikely but theoretically possible under the right circumstances, but the fire would not be fueled by a chemical reaction from the cell like in the case of a LiCo cell, so it would be a far less aggressive failure.
Myths:
"These are safe chemistry cells, so I can use them in anything!"
Flashlights that contain regulation circuits can over-discharge these cells severely. While over-discharging may not create any immediate danger, it will severely reduce the useful life of the cell. There are exceptions to every rule, some LED lights would be perfectly fine with LiMnO2 cells, some configurations becoming available will actually require them to handle the current demands safely, but each situations should be looked at individually.