# Telecom battery Long MSK400 2V 400Ah AGM ![Telecom battery Long MSK400 2V 400Ah AGM](https://baterias.com/1367-home_default/battery-long-msk400-2v-400ah.jpg) > Long MSK400 telecom battery 2V 400Ah AGM. MSK Series range. Dimensions 197Γ—170Γ—342 mm. Front terminal and long float life for cabinets and repeater sites. **Category:** [Batteries for telecommunications systems](https://baterias.com/gb/batteries-for-telecommunications-systems) β†’ [LONG](https://baterias.com/gb/long) - **Canonical URL**: https://baterias.com/gb/battery-long-msk400-2v-400ah - **Language**: en-GB - **Brand**: LONG - **Reference**: BCOM-LONG-MSK400 - **MPN**: MSK400 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | LONG | | Reference | MSK400 | | Model | MSK Series | | Voltage (V) | 2 V | | Largo | 197 cm | | Ancho | 170 cm | | Alto | 342.5 cm | | Peso | 25.5 kg | | TecnologΓ­a | AGM | | Capacity (C20) | 400 Ah (c20) | | Capacity (C5) | 340 Ah (c5) | ## Quick description **Long MSK400 2V 400Ah** is a front-terminal telecom battery: designed for cabinets and racks where servicing is done from the front. ### Why this telecom 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 πŸ”Œ Voltage 2 V ⚑ Capacity 400 Ah C20 πŸ“ Dimensions 197Γ—170Γ—342 mm βš™οΈ Technology AGM βš–οΈ Weight 25,5 kg 🏷️ Model MSK Series ## Description ## Stationary battery Long MSK400 MSK Series 400Ah 2V 2*V* Voltage 400*Ah* Capacity 25.50*kg* Weight The **Long MSK400** with AGM technology is a **400 Ah**, **2 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 197 Γ— 170 Γ— 342 mm format: same 400 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 MSK400 is for Designed for UPS, alarms, telecoms and emergency lighting, the Long MSK400 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 25.50 kg. ### Will it fit your current battery tray? It has external dimensions of 197 Γ— 170 Γ— 342 mm and weighs 25.50 kg. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change. ### Long: the maker behind the MSK400 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. At baterias.com we work directly with the manufacturer or its official distributor: real stock, brand-new product and official warranty. ### The Long MSK400: MSK Series range and AGM technology The **MSK Series** is the Long range the MSK400 belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle. In an AGM battery the electrolyte is absorbed in glass-fibre separators: there is no free liquid, it cannot spill and it can be mounted at an angle. That construction lowers internal resistance, speeds up recharging and multiplies cycle life compared with a conventional battery. ### Care and maintenance Check the float voltage of the UPS or charger: a voltage that is too high shortens the life of a sealed battery. Replace all the batteries in the set at once and avoid environments continuously above 25 Β°C. ### Manufacturer's warranty The Long MSK400 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. ### Shipping, delivery and returns Same-day dispatch from our warehouse for in-stock orders placed **before [[ks:cutoff]]**: 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 **[[ks:return_days]] days** if the battery has not been used (free collection on the Iberian mainland). You will receive tracking by email. ## Frequently asked questions ### Is this battery AGM? What is it for? Yes. The MSK400 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. ### How is the Long MSK400 battery installed in the vehicle? In most devices it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (βˆ’) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation β€” match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (βˆ’). On devices with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile. ### How long does the Long MSK400 battery last? Expected lifespan of the Long MSK400 is 5 to 8 years in mild-climate device use with Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured. ### What are the dimensions of the Long MSK400 battery? Dimensions (length Γ— width Γ— height) are 197Γ—170Γ—343 mm β€” also written as 197x170x343 mm β€” 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. ### Which batteries are equivalent to the Long MSK400? Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology β€” an EFB cannot be replaced with a conventional battery in Start-Stop devices. See the "Equivalents" section to view recommended options at the same performance level. ## Technical team (editorial authorship) The FAQs, guides and comparisons on this site are reviewed by the baterias.com technical team β€” over 25 years of experience validating automotive batteries. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-09-28*