Phoenix TX-1800 Tall Tubular Battery (185Ah)

The Phoenix TX-1800 is a 12V, 185Ah flooded tall-tubular deep-cycle battery — the volume seller of Phoenix's Power Cube series and one of the two or three default choices for UPS and hybrid-solar backup banks in Pakistan. As of 2 August 2026 it listed for Rs 37,000 to Rs 60,000 depending on the retailer — the widest same-day spread we tracked on any battery this size, and reason enough to shop it hard.

It stores 2.22kWh nameplate (about 1.78kWh usable at the rated 80% depth of discharge), weighs 56kg acid-filled, and carries a 12-month free replacement warranty on most current listings.

Specifications

A transparency note on the cycle figures: the most detailed listing we found (SolarPanelPrices.pk, opened 2 August 2026) headlines "1250 cycles @ 80% DoD" but its own spec table reads "1250 cycles (75% DoD)". Phoenix's official site publishes no TX-series datasheet to settle it (checked the same day), so we print both numbers rather than pick one.

Honest assessment

Pros. Proper tubular-plate construction at the price of a premium flat-plate battery: at the Rs 37,000 street end (2 August 2026) the TX-1800 matched the Osaka TA-1800 (Rs 37,500) as the cheapest name-brand 185Ah tubular on the market. Stock is everywhere, every battery-wala knows it, and a December 2024 buyer review on a retail listing reports a repeat customer choosing it after twelve years on Phoenix flat-plates — the brand's local reputation is real.

Cons. No official datasheet, no official price, and a warranty whose duration depends on which listing you read — 12 months on most, 6 months per The Saver Hub, and that same buyer review complains the warranty had been shortened to six months. The 62% same-day price spread means an unwary buyer can overpay by Rs 20,000 on a Rs 40,000 battery. And like all flooded tubulars it demands water top-ups and ventilation for its whole life.

Who should buy. Households running a 12V UPS or a 1kW-class hybrid inverter through daily load-shedding, on a hard budget, with someone willing to check water levels. If your bank budget clears roughly Rs 120,000, read the lithium math below before buying two of these.

Pakistan reality check

The price you pay is negotiable; the battery is not. On one day (2 August 2026) the TX-1800 was listed at Rs 37,000, Rs 37,000-47,000, Rs 42,999 (sale), Rs 45,500, Rs 55,700 and Rs 60,000 (list) across five retailers. Century Engineering publishes no list price, so every "discount" is theatre against a number the shop invented. Two questions before paying: is the quote with or without your old battery in exchange (scrap lead value is commonly baked in without being said), and what duration is stamped on the warranty card.

Cycle life at real Pakistani depth of discharge. The ratings ladder — 2500 cycles at 20% DoD down to 1250 at 75-80% — is the honest way to read tubular life: the deeper you drain daily, the faster it dies. A load-shedding household that flattens the bank to the inverter cutoff every evening is living at the 1250-cycle end, which is 3.5 years of daily cycles on paper and usually less in a 40C+ battery corner. Shallower daily cycling (bigger bank, same load) nearly doubles the paper life. Our DoD and heat guide covers the mechanism.

Water top-up reality. Ships acid-filled and unsealed. Summer top-ups with distilled water every two to four weeks are the warranty's fine-print condition, and dried-out cells are the classic rejected claim. Budget the jerrycan of distilled water into the cost of ownership.

Warranty claim reality. Claims go through your dealer against the stamped card and intact serial — there is no direct-to-factory route for retail buyers. With the card duration in dispute between listings (12 vs 6 months), the invoice line "12-month replacement warranty" written and stamped at purchase is worth more than any brochure.

Price context vs rivals (August 2026)

Live 185Ah-class listings, all opened 2 August 2026 on SolarPanelPrices.pk unless noted:

Shopped properly, the TX-1800 ties Osaka for the cheapest 185Ah tubular in Pakistan; bought lazily at list, it costs more than the premium AGS. Against lithium: two TX-1800s (Rs ~74,000-95,000 at street prices, ~3.55kWh usable at 80% DoD, ~1250 heavy cycles) deliver roughly Rs 17-21 per lifetime kWh, while a 2.4kWh LiFePO4 unit at Rs 120,000 rated >6000 cycles (Fronus Titan, W11Stop, 2 August 2026) works out to roughly Rs 10-11 — half the running cost for about 30-60% more upfront. The full comparison is in the lithium vs tubular guide, and the bigger sibling is the TX-2500.