Mk powered M40-12 SLD M · Wheelchair battery 12V 45Ah AGM
Specifications
| Brand | MK POWERED |
|---|---|
| Part number | M40-12 SLD M |
| Voltage (V) | 12 |
| Capacity (C20) | 45Ah (c20) |
| Capacity (C5) | 38.25Ah (c5) |
| Technology | AGM |
| Length | 198.10 mm |
| Width | 166.10 mm |
| Height | 170.90 mm |
€126.90
VAT included
MK Powered M40-12 SLD M 12V 45Ah 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 wearhandles deep discharges without losing capacity
- Sealed AGM/GELno maintenance, no risk of spills
- Thousands of useful cyclesover its full lifetime
Voltage
12 V
Capacity
45 Ah
Dimensions
198×166×170 mm
Technology
AGM
Weight
14,47 kg
Model
MK AGM
Uff te saca de un buen apuro, tu pedido llega en menos de 24 horas comprobado
Francisco Javier GallegoPuedes llamar, la asesoría es gratis y te ayudan a elegir batería y con la instalación
Eduardo LopezNo sé de baterías pero llamé y me indicarón la que me mi coche necesitaba
Francisco Javier Sanz
Reviews originally written in Spanish
Mobility battery MK Powered M40-12 SLD M Mk AGM 45Ah 12V
12VVoltage
45AhCapacity
14.47kgWeight
The 12 V, 45 Ah MK Powered M40-12 SLD M from the Mk AGM range with AGM technology is the standard replacement for power wheelchairs, mobility scooters and light electric vehicles. Its 198 × 166 × 170 mm make it the exact replacement for the 45 Ah battery fitted as standard to many power wheelchairs and mobility scooters.
- Approved for air and sea transport (VRLA).
- No maintenance, no water top-ups.
- Sealed AGM/GEL: safe indoors and in transport.
- AGM: faster recharging and better cycle resistance than a conventional battery.
What the MK Powered M40-12 SLD M is for
With 45 Ah, the MK Powered M40-12 SLD M 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 14.47 kg.
Will it fit your current battery tray?
In terms of format, the MK Powered M40-12 SLD M measures 198 × 166 × 170 mm (length × width × height) and weighs 14.47 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 M40-12 SLD M: Mk AGM range and AGM technology
Within the MK Powered catalogue, the Mk AGM series groups the references designed for this use. The M40-12 SLD M is the 45 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.
MK Powered: the maker behind the M40-12 SLD M
MK Battery (MK Powered) is the US specialist in AGM and GEL batteries for mobility: power wheelchairs, scooters and medical equipment rely on its batteries for safety and cycle life. All the MK Powered batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.
Official warranty
The MK Powered M40-12 SLD M 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.
Care and maintenance
Use the original charger or one compatible with the battery technology (AGM/GEL) and always replace both batteries in the set together. Recharge the wheelchair or scooter after each use and do not leave it discharged for days: lead sulphates and loses capacity.
When you get it and how to return it
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.
BCOM-MK-M40-12 SLD M
Data sheet
- Brand
- MK
- Reference
- M40-12 SLD M
- Model
- MK AGM
- Voltage (V)
- 12
- Length
- 198.10 mm
- Width
- 166.10 mm
- Height
- 170.90 mm
- Weight
- 14.47 Kgs
- Technology
- AGM
- Capacity (C20)
- 45Ah (c20)
- Capacity (C5)
- 38.25Ah (c5)
Specific References
- EAN13
- 8404653009069
- MPN
- M40-12 SLD M
5,00/5
Latest reviews
Reviews originally written in Spanish
★★★★★Francisco Javier Gallego
01/02/2026Llega al día siguiente
Uff te saca de un buen apuro, tu pedido llega en menos de 24 horas comprobado
★★★★★Eduardo Lopez
27/01/2026La ayuda muy útil
Puedes llamar, la asesoría es gratis y te ayudan a elegir batería y con la instalación
★★★★★Francisco Javier Sanz
29/12/2025facil de comprar y llega en tiempo
No sé de baterías pero llamé y me indicarón la que me mi coche necesitaba
Codes and references MK Powered M40-12 SLD M
| Brand | MK Powered |
|---|---|
| Manufacturer range | MK AGM |
| Manufacturer part number (MPN) | M40-12 SLD M |
| Also known as | M4012SLDM · M40 12 SLD M |
| EAN-13 barcode | 8404653009069 |
| Dimensions (length × width × height) | 198 × 166 × 171 mm (198x166x171) |
Recommended accessories
How to change the battery
Guide to replace a cyclic battery (12V 4-30Ah) for UPS, mobility scooter, alarm or backup device. Estimated time 10-15 minutes. Important: discharge residual voltage before handling.
Step 1. Power off and unplug the device
Unplug the device (UPS, scooter, alarm) and leave it off for at least 30 seconds to discharge residual capacitor voltage. Work on an insulating surface.
Step 2. Locate the battery compartment
Usually under the seat (mobility scooter/wheelchair), in the rear module of the UPS, or behind a side panel with screws. Check the device manual for unusual models.
Step 3. Disconnect the negative (−) first
With insulated gloves, remove the negative (−) cable first. Some UPS have protection fuses — note their position before removing.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery
Typical weight 1-15 kg depending on capacity. Many cyclic batteries are AGM/GEL — keep them upright. Do NOT invert the battery: even sealed, residue may exist.
Step 6. Fit the new battery
Same orientation and type (AGM, GEL or flooded). Polarity must match the device, not a chassis (this is not a car). Make sure terminals do not touch metal parts of the compartment.
Step 7. Connect the positive (+) first
On cyclic devices the order is reversed compared to cars: positive (+) first, negative (−) afterwards. Tighten without forcing — the plastic terminal housing of cyclic batteries damages easily.
Step 8. Initial charge before first use
Cyclic batteries ship at 60-80%. Before first use, connect the device charger for 8-12 hours (or use an AGM/GEL smart charger if available). This avoids short cycles and extends lifespan.
Frequently asked questions
Is the M40-12 SLD M model AGM? What does this technology offer?
Yes. The M40-12 SLD M 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 do I change this battery step by step?
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 (−) 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 — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On devices with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
How long does the MK Powered M40-12 SLD M battery last?
Expected lifespan of the MK Powered M40-12 SLD M 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 M40-12 SLD M model?
Dimensions (length × width × height) are 198×166×171 mm — also written as 198x166x171 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.
What are the equivalents of the M40-12 SLD M model?
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 — 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.
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