# Telecom battery Long MSK300 2V 300Ah AGM ![Telecom battery Long MSK300 2V 300Ah AGM](https://baterias.com/1366-home_default/battery-long-msk300-2v-300ah.jpg) > Long MSK300 telecom battery 2V 300Ah AGM. MSK Series range. Dimensions 170Γ—150Γ—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-msk300-2v-300ah - **Language**: en-GB - **Brand**: LONG - **Reference**: BCOM-LONG-MSK300 - **MPN**: MSK300 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | LONG | | Reference | MSK300 | | Model | MSK Series | | Voltage (V) | 2 V | | Largo | 170 cm | | Ancho | 150 cm | | Alto | 342.5 cm | | Peso | 21.2 kg | | TecnologΓ­a | AGM | | Capacity (C20) | 300 Ah (c20) | | Capacity (C5) | 255 Ah (c5) | ## Quick description **Long MSK300 2V 300Ah** 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 300 Ah C20 πŸ“ Dimensions 170Γ—150Γ—342 mm βš™οΈ Technology AGM βš–οΈ Weight 21,2 kg 🏷️ Model MSK Series ## Description ## Stationary battery Long MSK300 MSK Series 300Ah 2V 2*V* Voltage 300*Ah* Capacity 21.20*kg* Weight The **Long MSK300** with AGM technology is a **300 Ah**, **2 V** backup battery for UPS, alarms, telecoms and emergency lighting. It measures 170 Γ— 150 Γ— 342 mm, the format sought by anyone replacing a 300 Ah battery in UPS, alarm and emergency systems. - Long float life under permanent charge. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Maintenance-free for its whole service life. - Sealed and gas-free: suitable for cabinets and offices. ### Will it fit your current battery tray? In terms of format, the Long MSK300 measures 170 Γ— 150 Γ— 342 mm (length Γ— width Γ— height) and weighs 21.20 kg. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery. ### What the Long MSK300 is for Designed for UPS, alarms, telecoms and emergency lighting, the Long MSK300 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 21.20 kg. ### The Long MSK300: MSK Series range and AGM technology The **MSK Series** is the Long range the MSK300 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. AGM means the acid is held in a glass mat instead of floating free. That is why the battery can be installed in the cabin without gases, survives more cycles and recovers its charge quickly. ### Long: the maker behind the MSK300 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. ### Manufacturer's warranty The Long MSK300 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 Replace all the batteries in the set at once and avoid environments continuously above 25 Β°C. Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. ### 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 the Long MSK300 an AGM battery and what are the benefits of AGM? Yes. The MSK300 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 MSK300 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 our blog. 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. ### What is the service life of the MSK300 model? Expected lifespan of the Long MSK300 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 size is this battery? Dimensions (length Γ— width Γ— height) are 170Γ—150Γ—343 mm β€” also written as 170x150x343 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 MSK300? 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€” automotive battery specialists since 2012. β†’ https://baterias.com/gb/technical-team --- *baterias.com β€” Automotive batteries Β· 2026-10-19*