Amprius Technologies SiCore SA124 High Power Cylindrical Cell
Series: Amprius Technologies Battery cells for drone packs
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The Amprius SiCore SA124 is a cylindrical high-power cell in the 21700 format with a silicon anode, from Amprius Technologies. It is intended for medium multicopters that draw high current continuously in the hover. The data sheet is marked preliminary; individual values may change before the final version.
At 5,000 mAh, continuous discharge of 10C is specified. That gives 50 A, calculated from C-rate and capacity, and means the cell would be empty in about six minutes at that current. The energy density of 257 Wh/kg is the price of this current capability; the dimensions are 70.8 × 21.7 mm. 900 cycles are quoted, a high figure for a silicon cell.
At 50 A per cell, cell connectors and contact surfaces in the pack carry a large part of the load, and any weakness shows up as heat. Assembly therefore belongs in a specialist workshop with test and protection equipment. Like every lithium cell, the SA124 must meet the tests of UN 38.3 for transport and is packed protected against short circuit as a spare; for air travel the IATA limits of 100 and 160 Wh apply.
When choosing, what counts is how much current the motors actually draw in the hover. In a series string every cell carries the full pack current; with several parallel cells it is shared. The continuous current of 50 A applies under test conditions; in a warm fuselage less remains, so plan a reserve. Cycle figures refer to a fixed test profile, usually to 80 % remaining capacity.
Technical data
Other data
| C-rate | 10correct |
|---|---|
| Capacity (mAh) | 5,000correct |
| Cell chemistry | Li-Ion Si-Anodecorrect |
| Cell count (S) | 1Scorrect |
| Continuous current (A) | 50 Acorrect |
| Energy density (Wh/kg) | 257 kgcorrect |
| Form factor | 21,700correct |
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