# Telecom battery Long MSK500 2V 500Ah AGM ![Telecom battery Long MSK500 2V 500Ah AGM](https://baterias.com/1649-home_default/battery-long-msk500-2v-500ah.jpg) > Long MSK500 telecom battery 2V 500Ah AGM. MSK Series range. Dimensions 241Γ—172Γ—340 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-msk500-2v-500ah - **Language**: en-GB - **Brand**: LONG - **Reference**: BCOM-LONG-MSK500 - **MPN**: MSK500 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | LONG | | Reference | MSK500 | | Model | MSK Series | | Voltage (V) | 2 V | | Largo | 241 cm | | Ancho | 172 cm | | Alto | 340 cm | | Peso | 33.5 kg | | TecnologΓ­a | AGM | | Capacity (C20) | 500 Ah (c20) | | Capacity (C5) | 425 Ah (c5) | ## Quick description **Long MSK500 2V 500Ah** 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 500 Ah C20 πŸ“ Dimensions 241Γ—172Γ—340 mm βš™οΈ Technology AGM βš–οΈ Weight 33,5 kg 🏷️ Model MSK Series ## Description ## Stationary battery Long MSK500 MSK Series 500Ah 2V 2*V* Voltage 500*Ah* Capacity 33.50*kg* Weight Designed for UPS, alarms, telecoms and emergency lighting, the **Long MSK500** from the **MSK Series** range offers **500 Ah** with AGM technology on permanent float charge. It replaces the original battery without adaptation in UPS, alarm and emergency systems with a 241 Γ— 172 Γ— 340 mm format: same 500 Ah capacity. - Sealed and gas-free: suitable for cabinets and offices. - Maintenance-free for its whole service life. - AGM technology: absorbed electrolyte, no spills, can be mounted at an angle. - Long float life under permanent charge. ### What the Long MSK500 is for The Long MSK500 is designed for UPS, alarms, telecoms and emergency lighting: it sits on float charge and responds instantly to a mains failure. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 33.50 kg. ### Dimensions, polarity and mounting It has external dimensions of 241 Γ— 172 Γ— 340 mm and weighs 33.50 kg. Checking the three dimensions and the terminal position before buying avoids the most common mistake when replacing a battery. ### The Long MSK500: MSK Series range and AGM technology The MSK500 is part of the Long **MSK Series** range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family. 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. ### What Long does differently Long (Kung Long Batteries) is one of the world's largest manufacturers of sealed VRLA batteries. Its AGM and GEL series for UPS, mobility, alarms and cycling are found in equipment worldwide as original equipment. All the Long batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Warranty and coverage The Long MSK500 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. ### How to make it last longer Replace all the batteries in the set at once and avoid environments continuously above 25 Β°C. Check the float voltage of the UPS or charger: a voltage that is too high shortens the life of a sealed battery. ### Delivery times 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 MSK500 an AGM battery and what are the benefits of AGM? Yes. The MSK500 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 MSK500 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. ### What is the service life of the MSK500 model? Expected lifespan of the Long MSK500 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 measurements of the MSK500 model? Dimensions (length Γ— width Γ— height) are 241Γ—172Γ—340 mm β€” also written as 241x172x340 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 MSK500? 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*