Mercury 220Ah Tubular Battery — Price and Specs

Price current as of April 2026. Prices move with the naira exchange rate. Confirm today’s price on WhatsApp before you buy. See all available options on our tubular battery category page.

Which Tubular Battery Size Do You Need?

Tubular batteries come in different capacities. The right size depends on your inverter voltage, your load, and how many hours of backup you need. Here is a quick guide:

• 100Ah to 150Ah (12V): Suitable for small inverter systems (1kVA or below) powering basic loads like lights, fans, and phone chargers. Good for a single room or small shop. Expect 3 to 5 hours of backup on light loads (under 300W continuous). Budget-friendly entry point, but limited for anything beyond basics.
• 200Ah to 220Ah (12V): The sweet spot for most Nigerian homes. The Mercury Elite 220Ah at ₦295,000 fits this range. Paired with a 1.5kVA inverter (12V), one battery gives you roughly 5 to 8 hours depending on your actual load. Paired with a 3.5kVA inverter (24V), two in series give you 6 to 10 hours for a typical flat running fans, lights, TV, and fridge at around 500 to 600W average draw.
• 4 × 220Ah (48V bank): For common 48V systems in the 5kVA to 5.5kVA class. This configuration suits larger homes, duplexes, or small offices. At a typical domestic load of 800 to 1,200W, expect 8 to 12 hours of backup. Heavier loads (AC, multiple freezers) will reduce runtime significantly. Use our battery runtime calculator to check your exact scenario.

If you are not sure which size you need, send us your inverter size and appliances on WhatsApp and we will tell you exactly what to buy.

Why the Mercury 220Ah Tubular Is Our Best-Value Lead-Acid Battery

That is not a marketing slogan. Here are the numbers, comparing like for like across Mercury lead-acid batteries:

At ₦1,341 per amp-hour, the 220Ah tubular costs 30% less per Ah than the 200Ah GEL and 44% less than the 100Ah GEL. It also carries double the warranty. The trade-off is maintenance: you need to top up distilled water every 2 to 4 weeks and ventilate the battery area. If that is acceptable to you, tubular is the clear winner on upfront value among lead-acid options.

The Chemistry Behind a Tubular Battery

The Mercury Elite 220Ah is a flooded lead-acid tubular battery. That sentence sounds technical, but it explains almost everything about how the battery behaves in real life: why it is affordable, why it needs water, why it must be ventilated, and why it handles Nigerian power cuts better than many cheaper battery designs.

First, the chemistry. A tubular battery is still a lead-acid battery. It stores and releases energy through the reaction between lead plates, lead dioxide, and sulphuric acid electrolyte. During discharge, chemical energy becomes electrical energy to power your inverter. During charging, the reaction reverses and the battery stores energy again.

So what makes a tubular battery different? The difference is not the acid itself. The difference is the positive plate design. In a tubular battery, the active material is held inside tube-shaped structures instead of being spread on simpler flat plates. That matters because repeated deep discharge and recharge cycles cause stress inside a battery. The tubular design holds the active material more securely, which is why tubular batteries usually survive harsh inverter use better than ordinary flat-plate batteries.

This is exactly why tubular batteries make sense in Nigeria. PHCN does not fail politely. Power can disappear for hours, come back briefly, then disappear again. That kind of cycling is hard on weak batteries. A proper tubular battery is built for repeated deep cycling, which is why it remains one of the best-value options for homes and businesses that depend on inverter backup every day.

Because this is a flooded battery, the electrolyte is in liquid form. That is why you must top up with distilled water from time to time. As the battery charges, some water is gradually lost, especially in hot Nigerian conditions. Ignore this and the plates become exposed, heat builds up, and the battery starts dying from the inside.

Flooded lead-acid chemistry also explains the need for ventilation. During charging, especially at higher voltages, the battery can release hydrogen and oxygen gas. Hydrogen is highly flammable. That is why we never recommend installing tubular batteries inside sealed cupboards, under beds, or in poorly ventilated corners.

The chemistry also explains charging behaviour. Tubular batteries generally need a proper flooded/tubular charging profile. If your inverter is set incorrectly to GEL or AGM mode, the battery may undercharge over time. Undercharging leads to sulphation, where hard lead sulphate crystals build up and permanently reduce capacity. That is one of the most common reasons inverter batteries “become weak” long before their time.

Now the trade-off. Tubular chemistry gives you strong value per naira and solid deep-cycle durability, but it also comes with costs: more weight, slower charging, regular maintenance, gas ventilation requirements, and shorter long-term lifespan than lithium. In other words, tubular is not the most advanced chemistry. It is the most practical chemistry for buyers who want serious backup power without jumping straight to lithium pricing.

Tubular vs GEL — Which Lead-Acid Battery Should You Choose?

The honest answer: if you are willing to check water levels once or twice a month, the tubular battery is the smartest buy per naira among lead-acid options. If you want zero maintenance and can pay more upfront, a Mercury 200Ah GEL is the better fit. Browse all available tubular batteries at Mercury Direct, or read our complete inverter battery price guide for the full comparison across all battery types including lithium.

How to Size Your Tubular Battery Bank

The formula for calculating how much battery capacity you need:

Example: 3.5kVA Inverter with Tubular Batteries

A typical 3-bedroom Lagos flat running fans, lights, TV, fridge, and phone chargers draws about 500 to 600W continuously. For 8 hours of backup on a Mercury 3.5kVA inverter (24V system):

Need the full 8 hours? Add a parallel pair (4 batteries total) for 440Ah at 24V, which gives you over 13 hours at that load. Use our battery runtime calculator to test your exact appliance list.

How to Maintain Your Tubular Battery

Tubular batteries require maintenance. That is the trade-off for their lower price. But the maintenance is simple if you follow a routine:

• Check water levels every 2 to 4 weeks: Open the vent caps and inspect the electrolyte level. If the plates are exposed, the battery is already being damaged. Top up with distilled water only, never tap water or bottled drinking water. Fill to the marked level, not to the brim.
• Ventilate the battery room: Tubular batteries release hydrogen gas during charging. This gas is flammable. Keep the battery in a room with natural airflow or a vent, and never place batteries in a sealed wardrobe or under a bed.
• Clean the terminals every 3 months: White or green corrosion on the terminals increases resistance and reduces charging efficiency. Clean with a wire brush or baking soda solution, then coat with petroleum jelly to prevent new corrosion.
• Charge promptly after discharge: Leaving a tubular battery in a discharged state causes sulphation, which permanently reduces capacity. When PHCN comes back, let the inverter fully charge the battery before drawing from it again.
• Set your inverter to “flooded” or “tubular” mode: This is critical. Tubular batteries need a higher charge voltage than GEL or AGM. If your inverter is set to GEL mode while using a tubular battery, the battery will chronically undercharge and die early.

For more advanced tips, read our full battery lifespan guide.

Matching the 220Ah Tubular to Mercury Inverters

*Backup estimates assume a typical domestic load of 400 to 800W (fans, lights, TV, fridge). Heavier loads like air conditioning and deep freezers will reduce runtime significantly. Use our battery runtime calculator to check your exact load.

Not sure which inverter you need? Our guides on what a 1.5kVA can power, what a 3.5kVA can power, and what a 5.5kVA can power break it down by appliance. For wiring guidance, see our battery connection guide.

Why Buy from Mercury Direct

• Genuine 220Ah capacity: Cheap tubular batteries from market sellers often claim 200Ah or 220Ah but deliver far less. Mercury batteries are rated honestly.
• 2-year warranty: If something goes wrong, you call one number: 0703 745 1701. Try that with a market seller six months later.
• Proper sizing advice: We ask about your inverter and appliances before recommending a battery. No overselling, no underselling.
• Charge settings support: We help you set your inverter to the correct charge profile for tubular chemistry. Wrong settings are the number one cause of premature battery death.
• Same-day delivery in Lagos: Order today, receive today.
• Nationwide delivery: Anywhere in Nigeria within 48 hours.