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SigmasTek  |  SKU: BW-13293

MK 8GU1 GEL Compatible Replacement Battery

Sale price $120.81 USD Regular price $151.64
Shipping calculated at checkout.

➤ Pure Gel Technology ensures reliable deep cycle performance

➤ Durable ABS (UL94 V-0) case for enhanced safety and protection

➤ Low self-discharge rate of less than 2% per month for longer standby life

➤ Versatile use in marine, solar, electric wheelchairs, and scooters

➤ 1 year warranty with UL listing for guaranteed quality and peace of mind


📦🚀 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.

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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

MK Battery 8GU1 GEL Battery (Replacement) - Compatible with MK Battery 8GU1

The MK Battery 8GU1 GEL replacement battery delivers reliable compatibility, steady performance, and proven reliability for a wide variety of deep cycle applications. This replacement battery uses Pure Gel Technology to provide consistent discharge characteristics, low self-discharge, and dependable standby operation—making it a high-performance battery choice for solar arrays, marine systems, mobility devices, and other demanding environments. If you need a long-lasting battery that matches or exceeds OEM GEL specifications for the MK Battery 8GU1 model, this GEL replacement offers factory-fresh condition and UL listing for added peace of mind.

Key Specifications

  • Model: MK Battery 8GU1 (Replacement)
  • Battery Type: Pure Gel Technology (Not to Be Mistaken with Hybrid Gel)
  • Voltage: 12 Volts
  • Capacity: 35 AH
  • Case Material: ABS (UL94 V-0) Case
  • Self-discharge Rate: Less than 2% per month
  • Expected Life (Standby Use): 3 - 5 years
  • Orientation: Can be operated in any orientation
  • Storage: Up to 9 months at 25°C (77°F) before a freshening charge is recommended
  • Terminal Type: Nut & Bolt
  • Condition: Brand New and Factory Fresh
  • Warranty: 1 Year Warranty
  • Certifications: UL Listed

Benefits

  • Durability and long life: The Pure Gel Technology and UL94 V-0 ABS case provide a rugged, non-spillable construction that stands up to vibration and vibration-prone environments such as marine and mobility applications.
  • Reliable standby performance: With a self-discharge rate of less than 2% per month and an expected 3–5 year life in standby service, this replacement battery keeps backup systems ready when you need them.
  • High-performance battery behavior: Gel chemistry delivers stable output under deep cycle and float conditions—ideal where both cycle and standby use are required.
  • Versatile applications: Commonly used in marine applications, solar systems, electric wheelchairs, and scooters, and also well suited for UPS systems, emergency power solutions, and hand tools that require a dependable long-lasting battery source.
  • Safe storage and handling: Long shelf life at 25°C and the ability to operate in any position simplify installation, storage, and replacement for technicians and end users.

Ready to replace your worn battery? Choose this MK Battery 8GU1 replacement battery for proven GEL performance, dependable standby life, and peace of mind backed by UL listing and a one-year warranty. Order your high-performance replacement battery today and enjoy fast shipping and reliable service.


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