AMA Freemow 98700 40V 5000mAh Replacement Battery

AMA Freemow 98700 / 98710 — 40V Li-ion Replacement Battery

This 40V 5000mAh (200Wh) Li-ion battery fits the AMA Freemow 98700 and Freemow 98710 robotic lawn mowers. It slots into the same bay as the original pack and communicates with the mower's onboard BMS over the same data line. Capacity is drawn from product data, not estimated.

• Freemow 98700 and 98710 platform fit: Both models run the same 40V architecture, share the same connector pinout, and use the same BMS handshake protocol — one battery covers both units without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the Freemow platform, confirmed BMS handshake completion, and verified the charge acceptance voltage aligned with the mower's onboard charger thresholds across multiple cycles.
• Mowing schedule tip: If you run two batteries in rotation to cover back-to-back mowing sessions, bring each pack to full charge before storage between sessions — partial state-of-charge sitting idle accelerates cell imbalance in multi-cell 40V packs.

Why the Freemow 98700 cuts out mid-cycle without warning

The Freemow's cutting deck draws a short inrush spike each time the blade motor starts or re-engages after an obstacle avoidance manoeuvre. On a degraded original pack, this spike can push cell voltage briefly below the BMS undervoltage threshold, triggering an immediate shutdown. The mower reads this as a low-battery event even if the indicator shows charge remaining. A fresh pack with cells in balance maintains rail voltage through the inrush window and keeps the deck running through the full mowing zone.

Charger not recognising the new pack after it sat in storage

Li-ion packs self-discharge during storage, and if cell voltage drops below approximately 2.5V per cell, most chargers reject the pack rather than attempt recovery. The Freemow charger looks for a minimum voltage handshake before entering the main charge phase. If the charger shows no response or a blinking fault light, connect the pack and leave it on the charger for 15–20 minutes without interrupting — many chargers include a trickle pre-charge stage that slowly raises cell voltage to the acceptance threshold. Once cells reach around 3.0V per cell, the charger transitions to normal CC/CV charging.