Mk powered M55-12 SLD M · Wheelchair battery 12V 55Ah AGM
Specifications
| Brand | MK POWERED |
|---|---|
| Part number | M55-12 SLD M |
| Voltage (V) | 12 |
| Capacity (C20) | 55Ah (c20) |
| Technology | AGM |
| Length | 226.00 mm |
| Width | 135.00 mm |
| Height | 214.00 mm |
| Terminal type | M6 |
€199.10
VAT included
4,78/5★★★★★33 reviewsVerified purchases
- ★★★★★Mariano Nieto:
Pedí la batería un viernes a las 7 y me llegó el lunes a las 11
- ★★★★Adrian Hidalgo:
Me asesoraron en todo, excelente servicio
- ★★★★★Carlos Carrasco:
Con la más mínima duda recomiendo que llamen por telefono, os atenderán estupendamente
MK Powered M55-12 SLD M 12V 55Ah is a sealed AGM/GEL battery for daily mobility use: maintenance-free, no risk of spills, and thousands of useful cycles well beyond a starter battery.
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
55 Ah
Dimensions
226×135×214 mm
Technology
AGM
Weight
17 kg
Model
MK AGM
Mobility battery MK Powered M55-12 SLD M Mk AGM 55Ah 12V
12VVoltage
55AhCapacity
17kgWeight
The MK Powered M55-12 SLD M with AGM technology delivers 55 Ah at 12 V with the cycle life that power wheelchairs, mobility scooters and light electric vehicles demand. Its 226 × 135 × 214 mm make it the exact replacement for the 55 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 M55-12 SLD M is for
With 55 Ah, the MK Powered M55-12 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 17 kg and M6 terminals.
Will it fit your current battery tray?
The MK Powered M55-12 SLD M is made in the 226 × 135 × 214 mm format and weighs 17 kg. It uses M6 terminals, the system that anchors and connects it in the vehicle. 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 M55-12 SLD M: Mk AGM range and AGM technology
The Mk AGM is the MK Powered range the M55-12 SLD M 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.
Why choose MK Powered batteries
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. 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 MK Powered M55-12 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.
Usage and maintenance tips
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.
Shipping, delivery and returns
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-M55-12 SLD M
Data sheet
- Brand
- MK
- Reference
- M55-12 SLD M
- Model
- MK AGM
- Voltage (V)
- 12
- Length
- 226.00 mm
- Width
- 135.00 mm
- Height
- 214.00 mm
- Technology
- AGM
- Terminal type
- M6
- Capacity (C20)
- 55Ah (c20)
Specific References
- MPN
- M55-12 SLD M
4,78/5
Verified purchasesLatest verified reviews
★★★★★Mariano Nieto
30/06/2026Rapidez en la entrega
Pedí la batería un viernes a las 7 y me llegó el lunes a las 11
★★★★★Adrian Hidalgo
02/01/2026Me encantan
Me asesoraron en todo, excelente servicio
★★★★★Carlos Carrasco
01/01/2026Los mejores
Con la más mínima duda recomiendo que llamen por telefono, os atenderán estupendamente
★★★★★Mario Gallego
15/10/2025Recibí la batería en 1 día
Pedí la bateria un viernes a las 7 y me llegó el lunes a las 1
Comparison: MK Powered M55-12 SLD M vs equivalents
The MK Powered M55-12 SLD M is interchangeable with these equivalent references: DCG51-12 (Fullriver), HC55 (Fullriver), ES55-12 (Kronobat).
| Product | Specifications | Technology | Price |
|---|---|---|---|
MK Powered
M55-12 SLD M
This battery
|
12V 55Ah | AGM | €199.10 |
Fullriver
DCG51-12
|
12V 51Ah | AGM | €239.40 |
Fullriver
HC55
|
12V 55Ah 620A | AGM | €361.80 |
Kronobat
ES55-12
|
12V 55Ah | AGM | €194.95 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
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 MK Powered M55-12 SLD M an AGM battery and what are the benefits of AGM?
Yes. The M55-12 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 fit the M55-12 SLD M model in my device?
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.
What is the service life of the M55-12 SLD M model?
Expected lifespan of the MK Powered M55-12 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 dimensions of the MK Powered M55-12 SLD M battery?
Dimensions (length × width × height) are 226×135×214 mm — also written as 226x135x214 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.
Which batteries are equivalent to the MK Powered M55-12 SLD M?
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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