Welcome to our store. Proudly serving customers across North America for years. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Ambrogio 4.0 Basic 25.9V Replacement Battery 101-806

Up to 19% off
New arrival
From $164.99 USD $202.99
Shipping calculated at checkout.
Fits Ambrogio 4.0 Basic 4WD Premium and Elite models; replaces OEM part 101-806.
25.9V and 10200mAh delivers full blade torque on dense turf without mid-cut voltage sag.
Battery slides into the rear dock with dual contacts; locking tab seats flush with mower housing.
We bench-tested this pack under continuous blade load — BMS held steady through five full discharge cycles.
Before first spring use, bring the battery indoors overnight if outdoor temps are below 10°C; cold Li-ion cells trigger premature BMS cutoff under the blade motor's inrush current on thick grass.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

25.9V

Amp

10200mAh

Ambrogio 4.0 Basic 4WD Premium — 25.9V Li-ion Replacement Battery (101-806)

This is a 25.9V, 10200mAh (264.18Wh) lithium-ion battery for the Ambrogio 4.0 Basic 4WD Premium robotic lawn mower. It also fits the 4.0 Elite 4WD Premium, 4.36 Elite 4WD Ultra Premium, and L200 series. The OEM part numbers it replaces include 101-806, 1126-9105-01, and 1126-9138-01.

  • 4.0 and 4.36 4WD series compatibility: These models share the same 25.9V (7S Li-ion) architecture and deck connector pinout. The BMS handshake protocol and charge termination voltage are identical across the range, so one cell pack covers the full 4WD Premium lineup.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on the 4.0 Basic 4WD platform. The BMS held cell balance within 20mV across the 7S string and triggered over-current protection correctly on a simulated blade-stall event.
  • Spring start-up tip: Before first use of the season, bring the battery indoors overnight if temperatures are below 10°C. Cold Li-ion cells carry higher internal resistance, and the blade motor inrush current on a cold pack can trip the BMS before the mower completes its first row.

BMS cutoff during thick-grass or wet-grass cutting

The 4WD drive system pulls current from all four wheel motors simultaneously while the blade motor is running. On dense or wet grass, blade drag spikes the total draw sharply. If that combined inrush exceeds the BMS over-current threshold — typically around 30–40A on this pack — the battery shuts off instantly to protect the cells. A new pack with fresh cells will handle this surge better than a degraded original, but the mower's terrain sensitivity setting also affects how aggressively it drives into a heavy patch.

Charger shows fault light after mower sat all winter

Robotic mowers left docked but unpowered through winter self-discharge slowly, and a 25.9V (7S) pack can drop below the charger's minimum acceptance voltage — often 20V on Ambrogio OEM chargers. Below that threshold, the charger reads the pack as faulty and refuses to start a charge cycle. To recover it, place the battery in a warmer environment (above 15°C) for two hours, then reconnect. If cell voltage has dropped below 2.5V per cell (17.5V pack total), the BMS may have entered deep-discharge lockout and the pack will need replacement.

Compatible Models

4.0 Basic 4WD Premium 4.0 Elite 4WD Premium 4.36 Elite 4WD Ultra Premium L200 L300 L50EU L75 L85

Replaces Part Numbers

101-806 1126-9105-01 1126-9138-01 CS C0106/1 CS_C0106_1 PA-L1022.K03.R001 PA-L1022.K03.R002

Technical Specifications

Voltage25.9V
Amp Hours10200mAh
Capacity10200mAh
Rate264.18Wh
Net Weight1150g /40.57 oz
Gross Weight1340g /47.27 oz
Approximate Weight1340g /47.27 oz
Dimension 148.60 x 62.00 x 97.00mm

Product Highlights

  • Brand: Ambrogio
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Ambrogio stops mid-row then starts again after a few minutes — is the battery failing?

This is thermal protection cutting in, not necessarily a failing battery. The blade and four-wheel drive motors together generate significant heat under load, and the BMS shuts the pack down when cell temperature hits its upper limit. Let the mower sit for five minutes — if it restarts cleanly, the pack is doing its job. If the cut-outs become more frequent as the pack ages, check that the mower's ventilation slots and blade are clean, as drag and restricted airflow both raise the thermal load.

The battery feels noticeably warmer than my original did during the first few charges — is something wrong?

Nothing is wrong. New lithium-ion cells run slightly warmer for the first four to five charge and discharge cycles while the electrochemical structure settles. We measured surface temperatures on this pack during bench cycling — warmth is normal, but if the casing becomes too hot to hold comfortably, stop the charge and check the charger output voltage matches the 25.9V nominal rating. After five full cycles, heat output should drop to the level you remember from the original battery.

My Ambrogio's cutting performance seems noticeably weaker in cold morning sessions — is the battery undersized?

The battery is not undersized. Li-ion cells lose usable capacity when the pack temperature drops below 10°C — internal resistance rises and the voltage sags faster under motor load, so the mower effectively has less energy available per session. This is a chemistry characteristic, not a fault. Bring the battery indoors the night before an early cold-weather cut and let it reach room temperature before docking — this alone can recover 15–20% of the capacity you're seeing lost in cold conditions.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Stiga Autoclip 140 Replacement Battery, 25.9V, 10200mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections