Low voltage for Life-Li-ion
06-18-2017, 04:50 AM
#2
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Hi,
Summary: Full depletion= LiFE pack is 2.5v/cell and LiPo is 3.2v. The low voltage cutoff point is your choice, depending how close you want to get to these values. If you have a high current draw 3D machine vs. a Calypso park flyer with low draw, your LVC will be different. Depends on your flying style. You just don't want to draw below these voltages during a surge. Also, do you want a hard cutoff or soft cutoff? For general purposes set your ESC to soft cutoff at 2.7v/LiFe and 3.4v LiPO and you will be fine.
Cheers
From Hobbico:
A 6.6V 1100mAh LiFe battery has a NOMINAL voltage of 6.6 volts and a storage capacity of 1100 milliamphours, or 1.1 amp-hours. LiFe packs are made up of individual cells that are connected together in SERIES. Connecting cells in series adds the voltage of all cells to result in a total pack voltage. A 6.6V 1100mAh pack is made up of two 3.3V 1100mAh LiFe cells (2 × 3.3V = 6.6V). This is referred to as a “2S” pack, meaning two cells in series. Each LiFe cell has a NOMINAL voltage of 3.3V. A fully charged LiFe cell is 3.6V, and a fully depleted LiFe cell is 2.5V. Most LiFe chargers and balancing equipment are based using a battery’s nominal voltage rating as a parameter.
Summary: Full depletion= LiFE pack is 2.5v/cell and LiPo is 3.2v. The low voltage cutoff point is your choice, depending how close you want to get to these values. If you have a high current draw 3D machine vs. a Calypso park flyer with low draw, your LVC will be different. Depends on your flying style. You just don't want to draw below these voltages during a surge. Also, do you want a hard cutoff or soft cutoff? For general purposes set your ESC to soft cutoff at 2.7v/LiFe and 3.4v LiPO and you will be fine.
Cheers
From Hobbico:
A 6.6V 1100mAh LiFe battery has a NOMINAL voltage of 6.6 volts and a storage capacity of 1100 milliamphours, or 1.1 amp-hours. LiFe packs are made up of individual cells that are connected together in SERIES. Connecting cells in series adds the voltage of all cells to result in a total pack voltage. A 6.6V 1100mAh pack is made up of two 3.3V 1100mAh LiFe cells (2 × 3.3V = 6.6V). This is referred to as a “2S” pack, meaning two cells in series. Each LiFe cell has a NOMINAL voltage of 3.3V. A fully charged LiFe cell is 3.6V, and a fully depleted LiFe cell is 2.5V. Most LiFe chargers and balancing equipment are based using a battery’s nominal voltage rating as a parameter.
Last edited by kdunlap; 06-18-2017 at 11:58 AM.
