18V Gloria MultiJet Replacement Battery 2000mAh Li-ion

Gloria MultiJet 18V loses pressure halfway through cleaning and then cuts out completely — what's happening?

This is a thermal cutoff trigger, not a dead battery. The MultiJet's pump motor draws hard at the top of its pressure range (up to 24.9 bar), and a 2000mAh 18V pack at low state of charge can't sustain that current without the cell temperature tripping the protection circuit. Let the battery cool for 10 minutes, then check resting voltage — a healthy pack should read 19.8–20V off the charger, and anything under 17V under load points to a weak cell group. If it keeps cutting at the same point in the job, start at a lower pressure setting to reduce draw and confirm whether the pack recovers or keeps faulting.

Bosch Power for All charger shows a fault light when I put this replacement battery on it — won't start charging at all.

A fault light on first charge usually means the pack voltage has dropped below the charger's recovery threshold, which happens when a Li-ion battery has sat in a deeply discharged state. The Bosch Power for All platform chargers typically reject packs below around 10–12V because charging a deeply discharged Li-ion cell is a fire risk. Leave the battery connected for 5–10 minutes — some charger models will attempt a slow recovery pulse before switching to normal charge; if the fault clears, charging has started. If the fault light stays solid after 15 minutes, measure pack voltage directly across the terminals with a multimeter — below 10V and the pack needs to be replaced, not recovered.

Replaced the battery on my MultiJet and now the pump runs but water pressure is noticeably weaker than it was with the old pack — same sprayer, same tap feed.

Weak pressure with a running motor almost always means voltage sag under load — the battery is providing enough voltage to spin the pump but not enough to hold it at working speed against resistance. We see this on 2000mAh 18V packs when individual cell internal resistance has risen, even if resting voltage looks fine. Attach a multimeter and check voltage at the battery contacts while the washer is running — if voltage drops below 16V under load, the cells can't deliver the current the pump needs. A healthy pack holds above 17.5V running at the MultiJet's mid-pressure range.