Buying Guide: VIVI 48V 7.8Ah Battery for M026TGBUL AMAK Series E-Bikes

Quick Answer

The VIVI 48V 7.8Ah Battery (AMAK Series, 2024 and later models) is a proprietary replacement lithium-ion pack designed specifically for the 500W M026TGBUL electric bike [3]. With a 374.4Wh capacity, a 4-pin plug-in port, and an integrated power switch, it matches the exact physical dimensions (8.1 × 2.9 × 3.5 inches) and electrical cutoffs of the original equipment [3].

You should buy this battery if your current stock pack no longer holds a charge or has degraded on a 2024-later M026TGBUL model. However, you should not buy it if you own a 2023 version of the same bike name (which uses an XT60 female cable connection instead of 4 pins) or if you are looking for extended long-range touring capability, as its 7.8Ah capacity is tailored for modest daily commutes [3].

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Comparison Table: VIVI AMAK Series Replacement Options

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Buyer Scenarios

Scenario A: The Daily Campus or Urban Commuter

You rely on your 2024 M026TGBUL for a predictable 5-to-10-mile round-trip daily commute. Your original battery is showing reduced range after a couple of seasons of regular use. Because your route involves moderate terrain and you have access to a charger at your destination, this exact OEM 48V 7.8Ah replacement drops directly into your frame mount, restoring factory-spec pickup and reliability without forcing you to fiddle with aftermarket wiring adapters.

Scenario B: The Second-Hand E-Bike Restorer

You recently acquired a 2024-model VIVI 500W mountain e-bike second-hand, but it was sold without a battery or charger. You need a verified power source that communicates cleanly with the stock motor controller and fits the exact physical cradle. Buying this matching unit ensures the voltage thresholds, discharge parameters (18A BMS limit) [3], and 4-pin housing interface align seamlessly.

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Costs and Compromises

• Upfront Costs: Replacement proprietary e-bike batteries carry a fixed manufacturer price point with free standard shipping options, though delivery windows can span multiple weeks depending on warehouse fulfillment locations [3].
• No-Return Policy Risk: Vendor policies for this category strictly classify lithium batteries as non-returnable items. Ordering the wrong variant means zero refund or exchange options [3].
• Capacity Limitations: At 374.4Wh (7.8Ah) [3], this battery is engineered for lightness (5.5 lbs) [3] and moderate commutes. Riders seeking all-day touring or heavy throttle-only usage over long distances will find themselves recharging frequently.
• Lack of Physical Security Lock: Unlike frame-integrated cylinder batteries that lock down with a key, this specific M026TGBUL variant relies on a direct plug-in format with a power switch rather than a keyed retention cylinder [3].

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Compatibility Checks

Before completing any transaction, verify these four technical criteria against your exact e-bike:

1. Model Year Verification: Check your bike's frame sticker or manual. This specific 4-pin version is strictly for 2024 and later M026TGBUL (AMAK Series) builds. 2023 models utilize an XT60 cable connector instead [3].
2. Terminal Port Inspection: Pull your current battery and examine the mating interface. Ensure it features the 4-pin plug-in configuration matching the manufacturer specifications [3].
3. Voltage & Power Alignment: Confirm your motor system is rated for 48V and $\le$500W [3]. Using an incorrect voltage tier can permanently fry internal electronic speed controllers (ESCs).
4. Physical Dimensions: Measure your battery compartment space. The M026TGBUL pack measures roughly 8.1 × 2.9 × 3.5 inches [3].

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Pre-Purchase Checklist

• Confirmed the bike frame model reads M026TGBUL (AMAK series, 2024+) [3].
• Verified the terminal connection matches the 4-pin plug-in port layout [3].
• Acknowledged the strict non-returnable policy for specialized lithium battery products [3].
• Checked that your charger outputs the correct parameters (54.6V) [3].
• Realized that capacity is capped at 7.8Ah, fitting standard-range city or light trail commutes [3].

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Frequently Asked Questions

Can I use a higher capacity battery from a different brand?

Generally, no, unless the aftermarket battery matches the exact physical dimensions, communication protocols, and discharge port configuration of the proprietary frame mount. Using generic packs often leads to fitment failures or controller communication errors.

How long does a full charge take?

Using a standard 54.6V 2A charger, a complete charge cycle from a depleted state takes approximately 5 to 6 hours [3]. Never leave the battery charging unattended or exceed recommended charging windows [3].

What should I do if I am storing the e-bike for the winter?

If you store the e-bike for an extended period, maintain the battery charge level between 40% and 70%, and recharge it roughly every two months to prevent irreversible cell degradation that voids warranty coverage [3].

Why is the battery non-returnable?

Due to hazardous materials shipping regulations and safety laws governing lithium-ion energy storage products, vendors maintain strict no-return policies on specialized e-bike batteries once dispatched [3].

Does this battery come with a charger?

The standard package includes the electric bike battery pack itself [3]. You must use a compatible brand-regular charger matching the 54.6V specification [3].

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Research Limitations

This guide was formulated using manufacturer catalog specifications and public merchant disclosures available as of late 2026. Pricing tiers, shipping durations from international warehouses, and exact stock availability fluctuate dynamically. Buyers must independently verify their frame serial numbers and port configurations prior to purchase.