# Wheelchair battery MK Powered ES9-4 4V 9Ah AGM ![Wheelchair battery MK Powered ES9-4 4V 9Ah AGM](https://baterias.com/269-home_default/battery-mk-es9-4-4v-9ah.jpg) > MK Powered ES9-4 wheelchair battery 4V 9Ah AGM. Dimensions 101Γ—43Γ—102 mm. Deep-cycle and sealed, for daily wheelchair and mobility scooter use. **Category:** [Power Wheelchair Batteries](https://baterias.com/gb/batteries-for-electric-wheelchairs) β†’ [MK POWERED](https://baterias.com/gb/mk-powered) - **Canonical URL**: https://baterias.com/gb/battery-mk-es9-4-4v-9ah - **Language**: en-GB - **Brand**: MK POWERED - **Reference**: BCOM-MK-ES9-4 - **MPN**: ES9-4 - **Stock**: Out of stock ## Technical specifications | Feature | Value | |---|---| | Brand | MK | | Reference | ES9-4 | | Model | MK AGM | | Voltage (V) | 4 V | | Largo | 101.1 mm | | Ancho | 43.9 mm | | Alto | 102.1 mm | | Peso | 1.18 kg | | TecnologΓ­a | AGM | | Capacity (C20) | 9 Ah (c20) | | Capacity (C5) | 7.65 Ah (c5) | ## Quick description **MK Powered ES9-4 4V 9Ah** is a deep-cycle battery for wheelchairs and mobility scooters, optimised to be discharged and recharged daily down to 80 % DOD without losing range. ### Why this wheelchair battery? - **Daily cycling without wear** handles deep discharges without losing capacity - **Sealed AGM/GEL** no maintenance, no risk of spills - **Thousands of useful cycles** over its full lifetime πŸ”Œ Voltage 4 V ⚑ Capacity 9 Ah C20 πŸ“ Dimensions 101Γ—43Γ—102 mm βš™οΈ Technology AGM βš–οΈ Weight 1,18 kg 🏷️ Model MK AGM ## Description ## Mobility battery MK Powered ES9-4 Mk AGM 9Ah 4V 4*V* Voltage 9*Ah* Capacity 1.18*kg* Weight The **MK Powered ES9-4** with AGM technology delivers **9 Ah** at **4 V** with the cycle life that power wheelchairs, mobility scooters and light electric vehicles demand. Measuring 101 Γ— 43 Γ— 102 mm, it is the direct replacement for power wheelchairs and mobility scooters fitted from the factory with a 9 Ah battery of this format. - AGM: faster recharging and better cycle resistance than a conventional battery. - Sealed AGM/GEL: safe indoors and in transport. - No maintenance, no water top-ups. - Approved for air and sea transport (VRLA). ### What the MK Powered ES9-4 is for With 9 Ah, the MK Powered ES9-4 offers the daily range that power wheelchairs, mobility scooters and light electric vehicles need, with a sealed construction that is safe indoors. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 1.18 kg. ### Will it fit your current battery tray? In terms of format, the MK Powered ES9-4 measures 101 Γ— 43 Γ— 102 mm (length Γ— width Γ— height) and weighs 1.18 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 MK Powered ES9-4: Mk AGM range and AGM technology Within the MK Powered catalogue, the **Mk AGM** series groups the references designed for this use. The ES9-4 is the 9 Ah model of that family, with the same performance as its siblings in other sizes. 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. ### What MK Powered does differently MK batteries are the standard in the electric mobility sector: sealed, approved for air transport and with the consistency that wheelchair manufacturers demand as original equipment. All the MK Powered batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty. ### Warranty and coverage The MK Powered ES9-4 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 Charge with a charger that has an AGM mode: it limits the voltage and protects the glass-fibre separators. Recharge the wheelchair or scooter after each use and do not leave it discharged for days: lead sulphates and loses capacity. ### Delivery times and returns Order **before [[ks:cutoff]]** with stock available and it leaves today: mainland Spain and Portugal receive it in 24-48 working hours, the islands and the rest of the EU in 3 to 5 days. You have **[[ks:return_days]] days** to return it if it has not been installed, with free collection on the mainland, and shipment tracking by email. ## Frequently asked questions ### Is the MK Powered ES9-4 an AGM battery and what are the benefits of AGM? Yes. The ES9-4 from MK Powered 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 MK Powered ES9-4 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 many years does this battery last? Expected lifespan of the MK Powered ES9-4 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 MK Powered ES9-4 battery? Dimensions (length Γ— width Γ— height) are 101Γ—44Γ—102 mm β€” also written as 101x44x102 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 MK Powered ES9-4? 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. ## Reviews - **Average rating**: 4.74 / 5 (47 reviews) ## 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· 2026-09-29*