For questions, quotes, or help finding the right battery, feel free to email us at sales@batteryweb.com

New collections added! Learn more

🎉 First Order Special 🎉

First-time shoppers get 5% OFF on batteries & accessories!

WELCOME5
SigmasTek  |  SKU: BW-7748

Encore 52B 300 Lawn Mower High Performance Replacement Battery

Sale price $102.50 USD Regular price $135.64
Shipping calculated at checkout.

➤ Factory fresh and brand new for reliable performance

➤ 100% compatible with Encore 52B 300 Lawn Mower

➤ Uses Absorbent Glass Mat (AGM) technology for durability

➤ Valve regulated, spill-proof design for safety and maintenance-free use

➤ Backed by a 1-year warranty and guaranteed performance


📦🚀 FAST SHIPPING: Usually ships same day if ordered before 2 PM EST

⚠️ Quick Reminder

🔹 Please ensure the original battery model number is listed in our product description and that your device model number matches for compatibility.
🔹 We only supply the batteries shown in the images. Device images are provided for reference only.

📸 Send Your Battery Photo / Unsure? Expert 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 IMAGE

Battery Care Guide

Battery Usage and Maintenance Guidelines 🔋

Please read the following instructions carefully before using your new battery. Proper adherence will help ensure optimal performance and extended service life.

1. Cordless Phones, PDAs, and Power Tools (NiMH, NiCd, Lithium-Ion) 📱

Initial Charge

  • Fully charge the battery overnight prior to first use.

Conditioning (First 2–6 Charge Cycles)

  • Operate the device until the battery reaches approximately 20% capacity.
  • Avoid premature recharging.
  • Do not allow the battery to fully discharge during the initial cycles.

Post-Conditioning

  • Recharge the battery only when necessary.
  • These batteries are capable of approximately 500 charge cycles:
  • Once daily → ~500 days
    Twice daily → ~250 days
    Note: Even a partial recharge is considered a full cycle.

2. Sealed Lead Acid (SLA) Batteries 💡

  • No conditioning required.
  • Maintain the battery in a fully charged state; avoid complete discharge.
  • Capable of 300–400 charge cycles.
  • Expected service life: 2–3 years, depending on usage conditions.

3. Laptop Batteries (Lithium-Ion) 💻

Initial Charge

  • Fully charge the battery overnight prior to first use.

Conditioning (First 2–6 Charge Cycles)

  • Charge fully, then discharge to approximately 20% capacity.
  • Avoid complete discharge, as some devices may not detect a fully drained battery.

Post-Conditioning

  • Minimize frequent plugging and unplugging.
  • Allow the battery to discharge moderately at least once per month to maintain optimal performance.
  • Occasional cycling is recommended to sustain battery health.

Professional Recommendation

Adhering to these guidelines will enhance battery longevity and ensure reliable performance.

For further assistance regarding your battery or order, our customer support team is available to provide guidance.

Delivery and Shipping

Everything You Need to Know About Shipping with BatteryWeb (USA)

We know reliable delivery matters when you need power fast. Here’s how BatteryWeb makes shipping easy across the USA:

🚚 Shipping & Delivery

Most orders ship next business day (some products like sealed lead acid may take a little longer).

Same-day shipping available if you order before 11:59 AM (delivery depends on the carrier).

We ship nationwide using FedEx, UPS, USPS, DHL, and regional ground carriers.

Shipping costs are calculated automatically at checkout based on weight, distance, and carrier.

Transit times shown are estimates only (business days, no weekends/holidays).

🌍 Shipping Restrictions

Lithium batteries cannot be shipped by USPS or air. They must go via FedEx Ground, UPS Ground, or DHL Ground.

PO Box deliveries are only available via USPS.

At this time, we do not ship lithium batteries to Puerto Rico. NiMH, NiCd, and Alkaline can be shipped.

📦 Important Notes

Double-check your shipping address! If an incorrect address is used and the order is returned, re-shipping costs are the buyer’s responsibility.

If a product is temporarily out of stock, we’ll notify you right away with the expected restock date—or issue a refund if you prefer.

💲 Currency & Pricing

All prices are shown in USD.

Orders shipped outside the USA may be subject to local taxes, customs fees, or import duties. These are the buyer’s responsibility.

⚡ At BatteryWeb, we’re committed to getting your batteries delivered quickly, safely, and affordably—so you’ll always have the power you need, when you need it.

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.

🔹 Our products are generic replacement parts and are not affiliated with, endorsed by, or manufactured by the original equipment manufacturers (OEMs).


Volts & Amps

12 Volts | 35 AH

Terminal Type

Nut & Bolt

Replacement Encore 52B 300 Lawn Mower Battery — Compatible with Encore 52B 300

This replacement Encore 52B 300 Lawn Mower battery delivers the reliable compatibility, performance, and dependability you expect for your Encore 52B 300. Designed as a direct-fit replacement battery, this high-performance battery is factory fresh and built to restore full power to your mower quickly and safely. If you need a long-lasting battery that balances deep-cycle durability with spill-proof safety, the Encore 52B 300 replacement is engineered to meet those needs while using your existing cables and hardware for a straightforward installation.

Key Specifications

  • Compatible Model: Encore 52B 300 (100% compatible)
  • Required Quantity: 1 battery - SP12-35 NB
  • Voltage: 12 Volts
  • Capacity: 35 AH
  • Terminal Type: Nut & Bolt
  • Battery Technology: Absorbent Glass Mat (AGM) Technology
  • Usage Type: Designed For Deep Cycle Usage
  • Construction: Valve Regulated Spill Proof Construction
  • Energy Density: Power/Volume Ratio Yielding Unrivaled Energy Density
  • Certifications: U.L. Recognized and CE Certified
  • Condition: Brand New, Factory Fresh
  • Warranty: 1 Year Warranty
  • Performance: Performance Guaranteed

Benefits

  • Durability — Built with AGM technology and valve-regulated construction, this replacement battery is engineered to withstand repeated deep-cycle use common in lawn mowers and outdoor equipment. The rugged design helps resist vibration and delivers consistent power over time.
  • Long Life — As a long-lasting battery solution, the SP12-35 NB (12 V 35 AH) cell provides sustained capacity for prolonged run times. Expect dependable service life when maintained properly, backed by a 1 year warranty and a guaranteed performance policy.
  • High Performance — Optimized power/volume ratio yields high energy density so your mower gets reliable starting power and steady delivery for accessories and electrical loads. This high-performance battery helps keep blades spinning and electric systems operating at peak levels.
  • Safe and Maintenance-Friendly — Valve regulated and spill-proof construction reduces maintenance and risk, making it ideal for equipment that sees frequent use. AGM construction also provides better charge acceptance and lower internal resistance.
  • Typical Applications — Ideal as a replacement battery for lawn mowers (Encore 52B 300), garden tractors, small utility vehicles, and other applications requiring a 12V 35AH deep-cycle battery. Also suitable for emergency power needs and small UPS systems where a long-lasting battery is required.
  • Easy Replacement — This unit is a drop-in replacement using your original cables and hardware. For assistance, customer service is available at .

Restore full performance to your Encore 52B 300 with this reliable replacement battery. Order your high-performance battery today and enjoy fast shipping (most in-stock orders ship within 24 hours), backed by a one-year warranty and trusted specifications. Buy now to ensure your mower is ready when you are.


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.