BetaFPV BT2.0 550mAh 1S 40C HV LiPo Battery

BetaFPV BT2.0 550mAh 1S 40C HV LiPo Battery (Pack of 4)

BT2.0 batteries are well known for excellent performance and durability in 1S whoop drones, and the listing says the BT2.0 550mAh 1S battery achieves even better performance.

It is a LiHV pack with a 40C/80C rate and a BetaFPV BT2.0 connector, sold as a set of 4.

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Key features

• 550mAh: long flight times for a 1S pack.

• 40C/80C rate: strong burst current.

• LiHV 3.8-4.35V: high-voltage cell.

• BT2.0 connector: a low-resistance whoop connector.

• Pack of 4: spare batteries.

How a 1S HV whoop battery works

A 1S whoop battery is a single lithium cell with a small connector. HV (LiHV) versions can be charged to 4.35V per cell instead of 4.2V, which stores a little more energy, but they must be charged with a charger set to the HV mode and the correct current. A high C rating shows that the pack can deliver high burst current, which matters for the small brushless motors in tiny whoops.

The connector is part of the performance: a lower-resistance connector wastes less power as heat and reduces voltage sag under load. Match the connector to your drone (BT2.0 here) and never force it in the wrong way round.

Small packs are easy to damage. Charge them at no more than 1C unless the maker states otherwise, never charge a puffed or dented cell, and store them at about 3.8V. A voltage tester or a low-voltage alarm helps you land before the cell is over-discharged.

Log how each pack behaves over time. Note the resting voltage after a flight, how warm the pack is and how much capacity the charger puts back in. A pack that heats up more than usual, sags sooner or shows one cell drifting away from the others is telling you that it is ageing, and it should be retired before it fails in the air. Label your packs so you can rotate them evenly.