Mk powered M40-12 SLD G · Wheelchair battery 12V 40Ah 225A GEL
Specifications
| Brand | MK POWERED |
|---|---|
| Part number | M40-12 SLD G |
| Voltage (V) | 12 |
| Capacity (C20) | 40Ah (c20) |
| Capacity (C5) | 34Ah (c5) |
| Technology | GEL |
| Length | 197.10 mm |
| Width | 168.10 mm |
| Height | 174.80 mm |
€180.80
VAT included
4,83/5★★★★★28 reviewsVerified purchases
- ★★★★★Sascha P.:
sem dificuldades montar e andar
- ★★★★★Mariano Ortiz:
Uff te saca de un buen apuro, tu pedido llega en menos de 24 horas comprobado
- ★★★★★Ivan Pastor:
Puedes llamar, la asesoría es gratis y te ayudan a elegir batería y con la instalación
MK Powered M40-12 SLD G 12V 40Ah 225A 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
40 Ah
Cold cranking
225 A
Dimensions
197×168×174 mm
Technology
GEL
Weight
14,29 kg
Model
MK GEL
Mobility battery MK Powered M40-12 SLD G Mk GEL 40Ah 225A 12V
12VVoltage
40AhCapacity
225ACold cranking
14.29kgWeight
Designed for power wheelchairs, mobility scooters and light electric vehicles, the MK Powered M40-12 SLD G from the Mk GEL range offers 40 Ah of deep-cycle capacity with GEL technology. It replaces the original battery without adaptation in power wheelchairs and mobility scooters with a 197 × 168 × 174 mm format: same 40 Ah capacity.
- Thousands of useful cycles over its lifetime.
- Standard replacement format for wheelchairs and scooters.
- GEL technology: gelled electrolyte, fully sealed and maintenance-free.
- Designed to be discharged and recharged daily without losing capacity.
What the MK Powered M40-12 SLD G is for
The MK Powered M40-12 SLD G is the usual replacement in power wheelchairs, mobility scooters and light electric vehicles. Recharge after each use and avoid leaving it discharged for days. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 14.29 kg and C (INSERT) terminals.
Dimensions, polarity and mounting
The MK Powered M40-12 SLD G is made in the 197 × 168 × 174 mm format and weighs 14.29 kg. It uses C (INSERT) terminals, the system that anchors and connects it in the vehicle. For a direct replacement, the current battery tray must accept these dimensions and the same terminal layout; otherwise adapters will be needed or the hold-down will change.
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.
The MK Powered M40-12 SLD G: Mk GEL range and GEL technology
The M40-12 SLD G is part of the MK Powered Mk GEL range. Choosing the right reference within the series comes down to capacity, dimensions and terminals: technology and quality are common to the whole family.
GEL technology fixes the acid in a solid gel. That removes maintenance and leaks and gives very long cycle life, in exchange for slightly slower recharging and lower peak current than an AGM.
Care and maintenance
Recharge the wheelchair or scooter after each use and do not leave it discharged for days: lead sulphates and loses capacity. GEL batteries need lower charging voltages: always use a charger with a GEL mode so as not to damage the electrolyte.
Manufacturer's warranty
The MK Powered M40-12 SLD G 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.
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 G
Data sheet
- Brand
- MK
- Reference
- M40-12 SLD G
- Model
- MK GEL
- Voltage (V)
- 12
- Length
- 197.10 mm
- Width
- 168.10 mm
- Height
- 174.80 mm
- Weight
- 14.29 Kgs
- Technology
- GEL
- Terminal type
- C (INSERT)
- Cold cranking amps (EN)
- 225
- Capacity (C20)
- 40Ah (c20)
- Capacity (C5)
- 34Ah (c5)
Specific References
- EAN13
- 3660766462596
- MPN
- M40-12 SLD G
4,83/5
Verified purchasesLatest verified reviews
★★★★★Sascha P.Verified purchase
02/10/2026tudo conforme esperado
sem dificuldades montar e andar
★★★★★Mariano Ortiz
14/01/2026Rápido y correcto
Uff te saca de un buen apuro, tu pedido llega en menos de 24 horas comprobado
★★★★★Ivan Pastor
12/01/2026Me ayudaron a instalar la batería
Puedes llamar, la asesoría es gratis y te ayudan a elegir batería y con la instalación
★★★★★Juan Manuel Gallego
26/12/2025facil 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 G
| Brand | MK Powered |
|---|---|
| Manufacturer range | MK GEL |
| Manufacturer reference (MPN) | M40-12 SLD G |
| Also known as | M4012SLDG · M40 12 SLD G |
| EAN-13 barcode | 3660766462596 |
| Dimensions (length × width × height) | 197 × 168 × 175 mm (197x168x175) |
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 G model a gel battery? Where is it used?
Yes, this model is a GEL battery: sealed lead-acid where the electrolyte is in gel form. It tolerates deep discharges very well and is ideal for cyclic use (solar, motorhomes, electric wheelchairs, motorcycles). Requires a GEL-specific smart charger — max charge voltage ~14.1 V (vs 14.4-14.7 V for AGM). Lifespan 6-10 years.
How do I fit the M40-12 SLD G 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.
How long does the MK Powered M40-12 SLD G battery last?
Expected lifespan of the MK Powered M40-12 SLD G is 6 to 10 years in cyclic use (marine, caravan, solar) with controlled discharges. 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 × width × height) are 197×168×175 mm — also written as 197x168x175 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 M40-12 SLD G?
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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