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Specifications and Care Guidelines

Proper Operation of A123Systems High Power Lithium-Ion Cells

Handling Precautions!

CAUTION – do not short circuit. These cells are capable of very high currents.

DO NOT rotate the negative tap (cap) relative to the can, this can cause internal damage to the cell.

Note that the can is the positive terminal and the cap is the negative terminal .

Specification                                                                                                                                                                                       .

Cell type                                                                                          ANR26650-M1

Nominal voltage                                                                                        3.3 V

Nominal capacity                                                                                       2.3 Ah

Nominal dimensions                                                                Diameter 26 mm  Ht. 66.5 mm

Nominal weight                                                                                          70 g

Charging parameters: CC-CV (constant current - constant voltage)                                                                                                    .


Recommended charge current(0 – 60 degrees Celsius ambient temp.)                   3 A

Recommended charge voltage                                                                          3.6 V

Recommended cut-off current for CV hold                                                      0.05 A

Recommended float-charge current (-20 bis +60 degrees Celsius)                       3.45 V

Maximum continuous charge current (20 – 60 degrees Celsius ambient temp.)       10 A

Maximum recommended charge voltage                                                              3.8 V

Maximum allowable charge voltage                                                                    4.2 V

Fast charge time:                                                                                            15 min

Discharging parameters (- 30 bis + 60  Degrees Celsius ambient temperature)                                                                                    .

Recommended discharge cut-off voltage                                                            2.0 V

Maximum continuous discharge current                                                             60 A

Temperature parameters (skin temperature)                                                                                                                                       .

Maximum recommended cell temperature                                                     70 Degrees Celsius

Maximum allowable cell temperature                                                           85 Degrees Celsius

Allowable storage temperature range                                                      -50 bis +60 Degrees Celsius

Recommended charge method: CC-CV (constant current – constant voltage)                                                                                       .

The cell should be charged at the recommended charge current until the normal charge voltage of 3.6 V is reached. Apply a constant voltage hold at the recommended charge voltage until the cut-off current for CV hold is reached. The cell will be charged to 100 % state of charge.

If the voltage of the cells is to be held at the charge voltage after reaching 100 % state of charge for prolonged periods of time, the charge voltage should be lowered to the recommended float-charge voltage.

Recommended fast charge method                                                                                                                                                       .

Charge the cell at the maximum continuous charge current until the maximum recommended charge voltage is reached. Apply a constant voltage hold at the maximum recommended cell voltage until the total charge time reaches the fast charge time. The cell will be charged to over 96 % state of charge. Fast charge should not be attempted outside the recommended temperature range and should be stopped if the cell exceeds the maximum allowable cell temperature.

We recommend to use a charger with a special program for Li-Ion FEPO4 accus. We offer the Pulsar-2 charger, which offers a charge in 15 to 20 minutes.

In case your charger is not able to charge Li-Ion FEPO4 cells, you may use the Li-Ion Program of your charger with a maximum charge cut-off voltage of 4.1 V per cell and stop the charge at 3.8 V per cell. You may charge the cells to 4.1 V per cell, but this will reduce the life time of the cells. With a charge current around 5 A the cells reach 100% state of charge in 25 to 30 minutes depending on the charging program. To maximize the lifetime of the cells the charge should be stopped at the maximum recommended charge voltage.

The voltage drift in a pack of cells is very low. We recommend to balance the pack every 10 charge/discharge cycles or charge with an equalizer.


We recommend to apply fast charge at the flying field and apply standard charge with 3 A at home.

Recommended discharge method                                                                                                                                                        .

For optimum life, the cell should not be continuously discharged faster than the maximum cell continuous discharge current or allowed to self heat greater than the maximum recommended cell temperature. Operation above the recommended maximum cell temperature will result in degraded cell performance. Discharge should be stopped when the cell reaches the recommende discharge cut-off voltage or the maximum allowable cell temperature. Operation above the recommended maximum cell temperature will result in physical damage to the cell. At low temperatures, the maximum available discharge current will decrease.

The cell can be discharged at greater than the maximum continuous discharge current in pulses, but the cell should not be allowed to exceed the maximum allowable cell temperature. During pulse discharges, the cell voltage can safely fall below the recommended discharge cut-off voltage. Although it is safe to discharge the cell below the recommended discharge cut-off voltage, the cell should not be left at this level, and should be recharged to prevent permanent capacity loss and damage to the cell.

In case your ESC allows to program the cut-off voltage it should be set to 2.5 V leaving a bit of reserve for a second landing approach.

A voltage cut-off is not necessarily required, because the voltage drop at the end of the discharge cleary indicates the end of the discharge.

The capacity of the cell will decrease during use. Since First Connect has no control over the use of the cells, any guarantee and liability is ruled out.

Storage                                                                                                                                                                                             .

For prolonged storage of the cells they should be charged to 50 % state of charge. Check the voltage every 6 months and charge if required.

Disposal and Recycling - For disposal your countries regulations apply. Do not incinerate.

Safety                                                                                                                                                                                                .

The battery cell should not be opened, disassembled, crushed, burned, or exposed to high temperatures(>60C). Exposure to the following ingredients contained within the battery could be harmfull under some circumstances. Fires involving these types of batteries should be estinguished with CO2, Foam, or Dry Chemical extinguishing media. The following components are found in the battery:

Lithiated metal phosphate, Graphitic carbon, Polyvinylidene difluoride, Lithium hexafluorophosphate, Alkylene carbonates

Effects of overexposure: None under normal conditions, but in the event of exposure to battery contents the following could occur:

Vapor and mist is irritating to eyea, mucous membranes, and respiratory tract. Causes eye and skin irritation. Exposuremay cause nausea, dizziness, and headache. In case of contact with battery contents with eyes check for and remove any contact lenses. Immediately flush eyes with copious amounts of water for at least 15 minutes. Get medical attention. Flush skin with water, Cover the irritated skin with a 2.5 % calcium gluconate gel. Remove and wash contaminated clothing promptly. Get medical attention. If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical attention. If swallowed, wash out mouth with water provided person is conscious. Get medical attention immediately. Cells are no toys, keep away from children. Do not expose to Microwawes.

Mechanically damaged cells must be disposed of. Do not attempt to change defect cells in a pack.

Never solder directly to the cell casing as the heat will cause internal damage to the cell..

First Connect Ltd. & Co. KG, Grosse Twiete 50, 25499 Tangstedt

No liability for printing errors, subject to alteration.

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