iFlight Defender 16/20/25 900mAh Battery (2S/3S/4S)

iFlight's Defender-series packs cover all three airframes in one listing — pick the battery that matches your quad: Defender 16 (2S 900mAh), Defender 20 (3S 900mAh) or Defender 25 (4S 900mAh). All three are sized for their matching Defender frame's battery bay and include a built-in self-discharge module that bleeds the pack down to a safe storage voltage if it sits unused.

Key features

• Defender 16 (2S, 900mAh, 6.66Wh): 84 x 30 x 19mm, 48.5g, 25C discharge, built-in balance-head connector.
• Defender 20 (3S, 900mAh, 9.99Wh): 94 x 31 x 24mm, 68.5g, 20C discharge, built-in balance connector.
• Defender 25 (4S, 900mAh): 105 x 35 x 31.5mm, 100g, 60C discharge, standard XT30 connector.
• Automatic self-discharge protection guards long-term storage life; the Defender 16 and 20 packs add an adjustable LED strip.
• The 16 and 20 packs use a built-in balance-style connector rather than a separate main lead — iFlight's own charging adapter makes them chargeable on a standard smart charger.

Specifications

• Battery type: LiPo, 1P
• Capacity: 900mAh (all three)
• Connector: Built-in balance head (Defender 16/20), XT30 (Defender 25)

The Defender 25's 4S pack plugs straight into a standard XT30 charging lead; the smaller 16 and 20 packs need iFlight's own charging adapter unless your charger accepts their built-in connector directly.