The battery is one of the most important—and often most expensive—parts of any electric vehicle. Whether it’s powering a mobility scooter, an all-terrain scooter or an electric utility vehicle, looking after it properly can make a real difference to its performance and lifespan.
The important thing to understand is that not all batteries should be treated the same. The right charging routine for an AGM or Gel battery is quite different from what suits a lithium battery.
AGM and Gel batteries
Most traditional mobility scooters use sealed lead-acid batteries. These are generally AGM or Gel batteries, both of which fall within the broader VRLA—or Valve Regulated Lead Acid—family.
They’re well-proven, reliable and suited to delivering steady power over longer periods. They are also sealed, so there’s no need to top them up with water.
What they don’t like is being left partly or fully discharged.
If you’ve used your mobility scooter during the day, it’s generally best to plug it in when you get home—even if you only travelled a short distance. Leaving lead-acid batteries sitting in a discharged state is one of the most common causes of premature battery failure.
If the scooter isn’t being used regularly, keep an eye on the charge and follow the charging instructions supplied with it. Batteries can still gradually lose charge while sitting in storage.
They’re not the same as car batteries
AGM and Gel mobility batteries use lead-acid chemistry, but they’re not designed to do the same job as a normal car starting battery.
A car battery provides a short, powerful burst to start an engine and is then quickly recharged by the alternator. Mobility scooters need batteries designed to provide steady power over a much longer period.
That’s why fitting the correct deep-cycle battery matters. A battery can be the right physical size and still be unsuitable for the job.
Lithium batteries
Many newer electric vehicles use lithium batteries because they can store more energy for their weight, maintain their voltage well and generally offer a longer cycle life when looked after properly.
We use both of the main lithium chemistries across our range:
- NMC, or nickel manganese cobalt
- LiFePO₄, or lithium iron phosphate
Each has its strengths. NMC offers high energy density, which is useful when weight and range are important. LiFePO₄ is known for its stability and long cycle life, making it well suited to many utility and commercial applications.
Unlike AGM and Gel batteries, lithium batteries don’t need to be charged after every short trip. Partial charging is generally fine, and they don’t benefit from being constantly held at 100%.
For longer periods of storage, lithium batteries are usually happier somewhere around the middle of their charge range rather than completely full or empty. The exact recommendation can vary between products, battery chemistries and management systems, so it’s worth checking the instructions for your particular vehicle.
Use the correct charger
It’s important to use a charger designed for the battery chemistry and voltage in your vehicle.
A charger intended for a lead-acid battery may use a different charging profile from one designed for lithium. Even two batteries that appear similar from the outside may require quite different chargers.
We don’t recommend swapping chargers between vehicles unless you know they are compatible. Using the wrong one can shorten battery life, prevent a full charge or, in some cases, create a safety risk.
Range will naturally vary
Published range figures are useful for comparison, but they’re not a promise of exactly how far a vehicle will travel every time.
Real-world range is affected by:
- Hills and surface conditions
- Rider, passenger and cargo weight
- Tyre pressure
- Temperature and weather
- Speed and driving style
- Battery age and condition
A vehicle working across grass, gravel or steep ground will use more energy than the same vehicle travelling steadily on a flat, sealed surface.
If your usual journey is close to the vehicle’s maximum claimed range, it may be worth choosing a model with some capacity in reserve.
When a battery begins to lose capacity
All rechargeable batteries gradually lose capacity with age and use. You may notice that the vehicle no longer travels as far, feels slower on hills or needs charging more often.
That doesn’t always mean the battery is at fault. Low tyre pressure, a dragging brake, damaged wiring or a charger problem can produce similar symptoms.
Before replacing a battery, it’s worth having the complete system checked. We’ve seen batteries replaced unnecessarily when the real issue was somewhere else.
Battery replacement isn’t only about size
When the time does come for replacement, there’s more to consider than whether a battery fits into the available space.
The voltage, capacity, chemistry, terminal layout, discharge rating and charger compatibility all matter. With lithium batteries, the quality of the cells and battery management system is important too.
Cheap batteries can look much the same from the outside, but that doesn’t mean they’ll deliver the same performance or lifespan.
Recycling old batteries
Mobility and electric-vehicle batteries should never be placed in normal household rubbish.
Lead-acid batteries are widely recyclable, while lithium batteries require more specialised handling. Your local battery supplier, recycler or council should be able to advise on the options available in your area.
EV East can also help arrange responsible handling of batteries from the vehicles we support.
A little care goes a long way
There’s no single charging rule that suits every electric vehicle.
AGM and Gel batteries generally like to be recharged after use and kept from sitting flat. Lithium batteries are more flexible, but they still need the correct charger and sensible storage.
If you’re unsure what type of battery your vehicle has or how it should be charged, feel free to ask us. A little advice early on can save a fair bit of cost and frustration later.
