Nexfly 4S 11,000mAh Solid-State Drone Battery

Every Nexfly 4S pack ships with an integrated battery management system that monitors each of its 4 cells individually at ±5mV resolution, balances them (active and passive balancing), and cuts off on overcharge, over-discharge and short circuit — the short-circuit switch is MOSFET-based and responds in under a millisecond. Temperature is watched at multiple points in the pack, and fault events are logged, so a pack that has been abused shows it instead of hiding it. More on why this matters: BMS and drone battery safety.

Semi-solid state packs need no watering, venting or periodic equalising. Day-to-day care comes down to three habits: charge with a balance charger at the rate on the pack’s datasheet, let the pack cool below 35°C before charging, and store it at 50–60% charge if it will rest for more than 48 hours. At end of life, contact our Bangalore facility about return and collection for bulk quantities — see lithium battery recycling.

This pack is rated for 10C peak discharge — roughly 115A from its 11.5Ah capacity. Headroom like this suits airframes whose motors pull hard on take-off, climb-out and in gusty conditions. Charging time depends on your charger and the charge rate on the datasheet; our drone battery charger guide explains how to match the two.

The BMS supplies the state-of-charge and cell data behind your low-battery warning and return-to-home trigger. If your platform expects a specific smart-battery telemetry link to the flight controller (for example over UART or I2C), tell us the protocol when you request a quote — matching existing telemetry is part of our custom battery work for OEMs.

Semi-solid state chemistry stores more energy per gram than conventional LiPo — up to ~338 Wh/kg at pack level across the Nexfly range, against roughly 150–200 Wh/kg for standard LiPo — so the aircraft carries less battery for the same flight time. The energy density calculated for this specific pack is shown in the table below.