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iRobot Looj 125 Replacement Battery 7.2V 3600mAh 14501

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From $67.99 USD $83.99
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Fits iRobot Looj 125, Looj 135, and Looj 155 gutter cleaning robots; replaces OEM part number 14501.
7.2V, 3600mAh Ni-MH chemistry delivers full motor torque for the Looj's autonomous debris removal cycle.
Connector slides vertically into the battery slot with a single locking tab on the left side.
We bench-tested this cell across five charge cycles; the BMS accepted full voltage immediately with no cutoff anomalies.
Remove this battery from the dock immediately after charging reaches full — continuous trickle charging accelerates capacity fade in Ni-MH cells.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.2V

Amp

3600mAh

iRobot Looj 125 / 135 / 155 — 7.2V Ni-MH Replacement Battery (14501)

This is a 7.2V, 3600mAh Ni-MH replacement battery for the iRobot Looj 125, Looj 135, and Looj 155 gutter cleaning robots. It matches OEM part number 14501 and slots into the same bay as the original pack. The Looj's auger motor and drive system pull directly from this cell stack during operation.

  • Looj 125, 135, and 155 compatibility: All three models share the same 7.2V Ni-MH cell configuration, battery bay dimensions, and connector pinout. The same pack runs across the full Looj lineup because iRobot kept the power architecture consistent between generations.
  • Bench tested on actual hardware: We cycled this pack through repeated auger-load tests. The BMS held voltage steady under drive motor start-up current and recovered cleanly after sustained resistance from debris simulation. No premature cutoff was observed during normal gutter-pass workloads.
  • Looj storage between seasons: The Looj typically sits unused for months at a time. Store Ni-MH cells at roughly 40–60% charge between gutter seasons — a fully charged Ni-MH pack left idle for months self-discharges faster and can cause the charger to read the pack as faulty on the next use.

Why the Looj auger slows or stalls before the battery indicator drops

Ni-MH voltage sags under heavy auger load even when cell charge remains high. When the Looj hits a compacted leaf dam or wet debris, the auger motor draws a spike of current that temporarily drops cell voltage below the drive circuit's operating threshold. The robot reads this as a load fault, not a battery fault, so the indicator stays green while the auger loses torque or stops. A replacement pack with full cell capacity handles these load spikes with less voltage sag and holds the auger at working speed longer.

Looj won't start after sitting all winter — even on a full charge

A Ni-MH pack stored fully discharged for several months can drop below the charger's minimum detection voltage. The charger sees a pack that looks dead and refuses to start a charge cycle. This is a BMS re-initialisation issue, not a charger fault. If the replacement pack also shows this behaviour after storage, connect it to the charger for at least 30 minutes — some chargers require a resting voltage of at least 5.5V before the charge cycle triggers.

Compatible Models

Looj 125 Looj 135 Looj 155

Replaces Part Numbers

14501

Technical Specifications

Voltage7.2V
Amp Hours3600mAh
Capacity3600mAh
Rate25.92Wh
Net Weight420g /14.82 oz
Gross Weight570g /20.11 oz
Approximate Weight570g /20.11 oz
Dimension 133.17 x 48.03 x 24.60 mm

Product Highlights

  • Brand: iRobot
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Looj drives into the gutter but the auger barely spins even though the battery shows charged — what's happening?

This is voltage sag under load. The auger motor draws a current spike on start-up, and an aged Ni-MH pack can't sustain voltage through that spike even when the charge indicator shows full. The drive circuit keeps running at reduced motor speed rather than cutting out entirely, which is why the robot moves but the auger underperforms. Replacing the pack restores the cell capacity needed to hold voltage steady through auger start-up.

The Looj cuts out mid-gutter, pauses a few seconds, then starts moving again on its own — is this the battery or the motor?

This is a BMS overcurrent trip, not a motor failure. When the auger hits a blockage or compacted debris, current draw spikes past the BMS trip threshold and the pack shuts off momentarily. The few-second pause is the BMS resetting. Clear any debris from the auger path first — if the cut-outs stop, the pack was tripping on restriction, not cell failure. If cut-outs continue on a clear gutter with a fresh pack, check that the auger spins freely by hand before the next run.

My original Looj battery died after two seasons — how do I stop the replacement from fading the same way?

Most early Looj battery failures trace back to seasonal storage at full charge. Ni-MH cells self-discharge during storage, and a pack stored fully charged then left to drain to zero over winter degrades cell chemistry faster than normal cycling. After the final gutter run each season, run the Looj until the low-battery indicator activates, then remove the pack and store it separately at roughly half charge. Check resting voltage before the next season — a healthy 7.2V Ni-MH pack should read at least 7.0V after months of storage.

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