MK Battery M40-12 SLD G — 12V 40Ah Deep Cycle Sealed Gel Mobility Battery, Set of 2
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MK Battery M40-12 SLD G — 12V 40Ah Deep Cycle Sealed Gel Mobility Battery, Set of 2
Heavy daily use demands a heavy-duty battery. This set of two MK M40-12 SLD G sealed gel batteries delivers a full 24-volt system engineered for power wheelchairs and mobility scooters that work hard every day. With up to 1,000 cycles at 50% discharge, this is not a battery you replace every year — it is a long-term investment in your independence.
✔ Set of 2 — 24V System Total ✔ Up to 1,000 Deep Cycles ✔ FAA & DOT Approved ✔ Zero Maintenance
Specifications — Each Battery
| Model | MK Battery M40-12 SLD G |
|---|---|
| Voltage | 12 Volts |
| Capacity | 40 Amp Hours (Ah) |
| System Voltage (Set of 2) | 24 Volts Total |
| Battery Type | Deep Cycle Sealed Gel (VRLA) |
| Cycle Life | ~2,000 cycles at 25% / ~1,000 cycles at 50% / ~450 cycles at 100% |
| Self-Discharge Rate | Less than 2% per month |
| Temperature Range | -4°F to 122°F (-20°C to 50°C) |
| Travel Approved | FAA, DOT, IATA & ICAO Approved |
| Quantity | Set of 2 |
| Warranty | 1-Year Full Replacement Warranty |
Why Gel Over Standard SLA?
Standard sealed lead acid batteries work for light use — but if your scooter or power chair is your primary means of getting around, gel is the smarter choice. No acid, no fumes, no maintenance, and significantly more cycles over the life of the battery.
- No memory effect — recharge any time without reducing capacity
- Will not spill or leak — safe on any surface including carpet
- No equalization charging required — faster recharge time
- Will not discharge sitting on concrete
- Safe in any position — upright, on its side, inverted
- FAA, DOT, IATA and ICAO approved for air and public transport
Is Your Scooter Running Right?
Sometimes a sluggish scooter is more than just old batteries. If your equipment has been cutting out, losing power unexpectedly, or showing other signs of trouble, it may need a full diagnostic. Our Southwest Florida repair team services all major brands of mobility scooters and power chairs — read our Mobility Scooter Repair Guide to find out when to replace, when to repair, and when to call us.
Compatibility
The MK M40-12 SLD G fits a wide range of power wheelchairs and mobility scooters requiring a 24-volt deep cycle gel battery system. Please note — gel batteries require a gel-compatible charger. Call us before ordering and we will confirm fitment and charger compatibility for your specific equipment.
Call 1-866-218-0902 — Mon–Fri, 9am–5pm EST
Why Buy From Medical Department Store?
- 30+ years serving mobility customers — A+ BBB Rated
- 110% Low Price Guarantee — we beat any competitor
- Mobility specialists on the phone, not a call center
- Ships to all 50 states — 5 Southwest Florida locations for local pickup
Ready to order or have a question first? Call 1-866-218-0902 — our team will make sure you get the right batteries and the right charger before you buy.
