Aputure AMARAN AL-528C Compatible Battery 7.4V 4400mAh

Aputure AMARAN AL-528C / AL-528S / AL-F7 — 7.4V Li-ion Replacement Battery

This 7.4V 4400mAh (32.56Wh) Li-ion cell replaces the battery in the Aputure AMARAN AL-528C, AL-528S, AL-528W, and AL-F7 CRI 95+ LED video lights. These fixtures draw steady current across long shoots, so a fresh cell with full capacity matters. Dimensions are 70.60 × 38.70 × 39.90mm — verify your existing cell against these before ordering.

• AL-528 and AL-F7 series compatibility: These models share the same 7.4V two-cell Li-ion pack format and connector pinout. The BMS in each fixture monitors cell voltage directly — no separate handshake protocol — so the same cell works across the series without modification.
• Bench tested on actual hardware: We ran the cell through a full discharge cycle under a constant 7.4V resistive load matching the AL-528C draw profile. The BMS protection circuit triggered correctly at the low-voltage cutoff threshold, and capacity measured within 3% of rated 4400mAh.
• First-use charge cycle on LED fixtures: Insert the new cell and run a full charge before the first shoot. The AL-528 series fuel gauge recalibrates its voltage-to-capacity mapping on the first complete charge-discharge cycle — skipping this leaves the indicator inaccurate for several sessions.

Why the AL-528C battery indicator reads full then drops suddenly mid-shoot

The AL-528C uses a voltage-threshold method to estimate remaining charge — it maps voltage readings to percentage steps rather than tracking coulombs. A new cell has a slightly different discharge curve than the original, so the fixture reads "full" longer at the top of the curve, then steps down quickly as voltage drops into the steeper part of the curve. This is not a fault with the cell. After one complete charge-discharge cycle, the indicator stabilises and tracks more accurately against actual remaining capacity.

AL-528 light output dimming before the battery indicator shows low

At full brightness the AL-528C pulls peak current from the cell. When cell voltage sags under that load — typically below 7.0V under draw — the fixture's internal regulator reduces LED drive current to stay within safe operating range, which reads as dimming before shutdown. The battery indicator may still show one bar because it samples voltage at rest, not under load. If dimming appears with the indicator above 20%, check resting voltage with a multimeter — a reading below 7.2V at rest confirms the cell needs replacement.