# Stationary UPS battery Long WP1251W 12V 12Ah AGM ![Stationary UPS battery Long WP1251W 12V 12Ah AGM](https://baterias.com/1289-home_default/battery-long-wp1251w-12v-12ah-51wh.jpg) > Long WP1251W stationary UPS battery 12V 12Ah AGM. WP WATT Series range. Dimensions 151×98×98 mm. Long float life for UPS, alarms and standby equipment. **Category:** [Batteries for UPS / UPS](https://baterias.com/gb/batteries-for-sai-ups) → [LONG](https://baterias.com/gb/long) - **Canonical URL**: https://baterias.com/gb/battery-long-wp1251w-12v-12ah-51wh - **Language**: en-GB - **Brand**: LONG - **Reference**: BCOM-LONG-WP1251W - **MPN**: WP1251W - **Last updated**: 2026-10-28 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | LONG | | Reference | WP1251 W | | Model | WP WATT Series | | Voltage (V) | 12 V | | Largo | 151 cm | | Ancho | 98 cm | | Alto | 98 cm | | Peso | 3.65 kg | | Tecnología | AGM | | Capacity (C20) | 12 Ah (c20) | | Energy (Wh) | 51 Wh | ## Quick description **Long WP1251W 12V 12Ah** is a stationary battery for backup power systems: UPS, alarms, telecom and emergency lighting. Long float-life under permanent charge and instant response to mains outages with no noticeable voltage drop. ## Why this stationary battery? - **Instant response** when the mains drop, no voltage dip - **Long life under 24/7 charge** optimised for permanent service - **Compatible with your system** existing UPS units and alarm control panels 🔌 Voltage 12 V ⚡ Capacity 12 Ah C20 📏 Dimensions 151×98×98 mm ⚙️ Technology AGM ⚖️ Weight 3,65 kg 🏷️ Model WP WATT Series ## Description ## Stationary battery Long WP1251W WP WATT Series 12Ah 12V 12*V* Voltage 12*Ah* Capacity 3.65*kg* Weight The **Long WP1251W** with AGM technology is a **12 Ah**, **12 V** backup battery for UPS, alarms, telecoms and emergency lighting. It replaces the original battery without adaptation in UPS, alarm and emergency systems with a 151 × 98 × 98 mm format: same 12 Ah capacity. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Long float life under permanent charge. - Sealed and gas-free: suitable for cabinets and offices. - Maintenance-free for its whole service life. ### What the Long WP1251W is for Designed for UPS, alarms, telecoms and emergency lighting, the Long WP1251W is sealed, gas-free and suitable for technical cabinets and offices. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 3.65 kg. ### Size, terminals and hold-down of the Long WP1251W It has external dimensions of 151 × 98 × 98 mm and weighs 3.65 kg. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters. ### The Long WP1251W: WP WATT Series range and AGM technology Within the Long catalogue, the **WP WATT Series** series groups the references designed for this use. The WP1251W is the 12 Ah model of that family, with the same performance as its siblings in other sizes. AGM (Absorbent Glass Mat) technology seals the electrolyte in glass microfibre. The result is a maintenance-free battery that is highly vibration-resistant and able to withstand deep discharges that would ruin a classic lead-acid battery. ### Long: the maker behind the WP1251W Long batteries combine large-scale production with ISO quality standards and a batch-to-batch consistency that has made them the de-facto standard in backup systems and electric mobility. All the Long batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Manufacturer's warranty The Long WP1251W comes with the **manufacturer's official warranty** against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you. ### Usage and maintenance tips Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. Check the float voltage of the UPS or charger: a voltage that is too high shortens the life of a sealed battery. ### Shipping, delivery and returns Same-day dispatch from our warehouse for in-stock orders placed **before 6:00 pm**: 24-48 working hours in mainland Spain and Portugal, 3 to 5 days in the islands and the rest of Europe. Returns are accepted for **14 days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### Is the Long WP1251W an AGM battery and what are the benefits of AGM? Yes. The WP1251W from Long uses AGM (Absorbent Glass Mat) technology: a sealed lead-acid battery where the electrolyte is absorbed in a glass-fibre mat. It withstands more charge/discharge cycles than a conventional one, handles heat better and is the required technology for devices with advanced Start-Stop and regenerative braking. Expected lifespan: 5-8 years under normal conditions. ### What are the dimensions of the Long WP1251W battery? Dimensions (length × width × height) are 151×98×98 mm — also written as 151x98x98 mm — following the European DIN standard. Always measure the space in your device before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals. ### Long WP1251W or Ritar RT12120: which one to choose? Same case and same technology as the WP1251W: an alternative by size, not an official equivalent. Compared with the WP1251W it has the same Ah and cranking power. It costs €66.10 more. If the polarity matches and your equipment had a similar capacity, it works as a replacement; if in doubt, ask us with your model. ### Long WP1251W or Q-battery BATTERY-12LS-12 F1: which one to choose? It has the same dimensions, voltage and technology as the WP1251W, although it is not a manufacturer-approved equivalent. Compared with the WP1251W it has the same Ah and cranking power. It costs €50.30 more. Check the positive terminal side and the original capacity before ordering; otherwise it is a straight swap. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team — automotive battery specialists since 2012. → https://baterias.com/gb/technical-team --- *baterias.com — Automotive batteries · 2026-11-01*