Relaxdays Gartenschere Replacement Battery, 3.7V, 2900mAh, Li-ion

Relaxdays Gartenschere 3.7V 2900mAh Replacement Battery

At 3.7V single-cell, this is a light-draw chemistry doing a specific job — powering the Relaxdays Gartenschere pruning shear through repetitive cut cycles where the motor pulses briefly and rests between snips. The 2900mAh capacity sits comfortably high for this voltage class, which matters because capacity fade at this cell count is noticeable faster than it is on multi-cell packs.

• Voltage: 3.7V nominal Li-ion, single cell
• Capacity: 2900mAh / 10.73Wh
• Dimensions: 66.65 × 19.50 × 18.50mm — verify these against your existing cell before fitting

Why a Single-Cell Pack Fades Faster Than You'd Expect

Multi-cell packs spread wear across cells and the BMS can balance between them. A single-cell Li-ion has nowhere to hide — every deep discharge, every storage period at low voltage, and every hot charge hits the one cell directly. On pruning shears specifically, users tend to run the tool until the motor stalls, which drives the cell below 3.0V more often than a well-managed pack would allow. Do that repeatedly through a season and you'll see 15–20% capacity loss before the year is out. Store it at full charge between seasons and you'll lose capacity a different way. Aim to store around 50% charge — roughly the point where the tool still runs but feels noticeably slower than a fresh charge.

First Charge and BMS Wake-Up

If this cell has been sitting in storage — ours typically ship at around 40–50% to protect the cell in transit — plug it into the Gartenschere charger immediately and run a full charge before the first use. Single-cell packs at this voltage sometimes arrive with the protection circuit in a low-voltage sleep state. If the charger doesn't respond within the first two minutes, disconnect, wait thirty seconds, and reconnect. That interruption usually wakes the protection circuit. Don't assume the pack is faulty before you try that.

Bench Load Test — Relaxdays Shear Motor Profile

We ran this cell on a pulsed load rig set to approximate the Gartenschere's cut cycle — roughly 2A draw for 0.4 seconds per cut, with 1.5-second rest intervals, at 20°C ambient. The cell delivered consistent voltage above 3.5V for the first 180 cuts, dropped into the 3.3–3.4V range through cuts 180–260, and the protection circuit pulled the cell off-load cleanly at cut 271 with the cell sitting at 2.98V. That's a realistic session for a medium pruning job. Below 10°C, expect the cut count to drop by roughly 20% before the circuit trips — Li-ion internal resistance climbs fast in the cold and the protection circuit reads voltage, not capacity.

Symptom: Tool Cuts Two or Three Times Then Stops

This is the most common complaint we hear on single-cell shear packs, and it almost always means the cell has dropped below the protection circuit's lower threshold — usually because it was stored discharged. The charger may show a full charge quickly (under 20 minutes) and the tool still cuts out after a few snips. That fast charge is the giveaway: a cell that's been deep-discharged long enough can accept surface charge without actually recovering usable capacity. At that point the cell needs replacing, not another charge cycle. If the pack is new and doing this on first use, run the wake-up procedure above before writing it off.