58V AEG Blower Replacement Battery 5000mAh Li-ion

My AEG 58V blower starts strong then cuts out halfway through the yard — why does it keep shutting off?

That's thermal cutoff triggering under sustained high-draw use — blowers pull hard on the battery continuously, and if the cells heat past the protection threshold, the BMS shuts the pack down before damage occurs. It happens more often with aftermarket or degraded batteries that can't hold voltage under load. Let the pack cool for 10–15 minutes, then check whether it restarts at full power or limps back on reduced output — the difference tells you whether it's thermal protection or voltage sag from weak cells. Put a multimeter on the pack terminals after a shutdown; a rested 58V Li-ion should read above 54V, and anything below 50V under no load means the cells aren't recovering properly.

New 58V battery clicks into the blower fine but the blower won't turn on at all — no lights, nothing

The most likely cause is a contact alignment issue or the pack not fully seating past the secondary latch — AEG 58V packs have a two-stage lock and a loose fit will break the circuit entirely. Press the pack in firmly until you hear both clicks, then try again before assuming a fault. If it still shows nothing, check the battery's indicator lights by pressing the charge-level button on the pack itself — if those don't light up either, the pack arrived in deep discharge and needs a charger that can recover low-voltage Li-ion cells. Put it on charge for at least 30 minutes and confirm the charger shows an active charge state, not a fault light, before testing in the tool again.

AEG 58V blower runs fine on low speed but bogs down and feels weak the moment I switch to high

This is voltage sag — at high speed the brushless motor demands a spike in current draw, and a battery with degraded cells can't sustain the output voltage, so the tool's electronics throttle back to protect the motor. It's common in 58V packs that have been stored partially discharged or cycled heavily, because individual cells drift in capacity and the weakest cell limits the whole pack. Run the battery down fully on low speed, charge it completely, then test on high again — one full cycle sometimes recovers mild sag. If it still bogs, check the resting voltage after a full charge; a healthy 5Ah 58V Li-ion pack should sit at 58–60V off the charger, and anything under 56V means the cells aren't reaching full capacity.