Not all wheelchair batteries are lithium, but they are becoming the preferred choice for many users.
While traditional sealed lead-acid (SLA) batteries are still common, modern lithium-ion batteries offer a lighter, longer-lasting, and more efficient power source for your electric wheelchair.
The type of battery you choose will depend on your specific needs, budget, and how you use your wheelchair.
In this guide, we'll explore the different types of wheelchair batteries out there (including the ones on our site), compare their pros and cons, and help you decide which option is right for you.
We'll also answer some of the most common questions people have about these important batteries, from air travel to safety concerns.
3 Main Types of Wheelchair Batteries
Let’s start here.
When it comes to powering your electric wheelchair, you have three main choices: lithium, Absorbent Glass Mat (AGM), and gel batteries. Each has its own set of advantages and disadvantages, so it's important to understand the differences before you make a decision.
1. Lithium-Ion Batteries
Lithium-ion batteries are the newest technology on the market but are quickly becoming the most popular choice for electric wheelchairs. They represent a significant advancement in wheelchair power technology, offering numerous advantages that directly impact your daily mobility experience.
The most noticeable benefit you'll experience with lithium batteries is their exceptional weight reduction. A typical lithium battery weighs about 60-70% less than comparable lead-acid batteries (see this post for a full breakdown of lithium vs. lead acid batteries), which means your wheelchair will be significantly easier to transport and maneuver. This weight savings becomes especially important when loading your wheelchair into a vehicle or navigating tight spaces in your home.
Beyond weight, lithium batteries provide superior range and consistent power output. You can expect to travel 20-30% further on a single charge compared to traditional batteries. Even more importantly, lithium batteries maintain their power output throughout the discharge cycle, so your wheelchair won't slow down as the battery drains. This consistent performance means you can rely on full speed and torque even when your battery indicator shows lower levels.
However, lithium batteries do come with some considerations specific to wheelchair use.
They can be more sensitive to extreme temperatures, particularly cold weather, which may reduce their performance during winter months.
Additionally, if damaged, lithium batteries pose a greater safety risk than lead-acid alternatives, requiring more careful handling during transport and storage. The charging process also requires compatible chargers, so you can't simply use any wheelchair charger you might have on hand.
2. Absorbent Glass Mat (AGM) Batteries
AGM batteries are a type of sealed lead-acid battery that has become the workhorse of the wheelchair industry. They offer a practical middle ground between traditional flooded lead-acid batteries and premium lithium options, making them an excellent choice for many wheelchair users.
One of the biggest advantages of AGM batteries for wheelchair use is their exceptional durability and tolerance for deep discharge cycles. You can regularly drain these batteries to 20-30% capacity without significantly impacting their lifespan, which is perfect for wheelchair users who need reliable all-day power. AGM batteries also handle vibration and shock extremely well, making them ideal if you frequently travel over rough terrain or use your wheelchair outdoors on uneven surfaces.
From a practical standpoint, AGM batteries are very forgiving.
They can sit unused for extended periods without damage, making them perfect if you don't use your wheelchair daily. They also work with standard wheelchair chargers, so replacement and maintenance are straightforward. The charging process is reliable and predictable, typically taking 6-8 hours for a full charge.
The main drawbacks of AGM batteries center around their weight and size.
They usually weigh 50-60 pounds for a pair, which adds considerable bulk to your wheelchair and makes transport more challenging. You'll also notice that AGM batteries provide less range than lithium alternatives and may experience some power reduction as they discharge. In cold weather, AGM batteries can lose up to 20% of their capacity, which might limit your mobility during winter months.
3. Gel Batteries
Gel batteries are another type of sealed lead-acid battery that uses a gel-like substance instead of a liquid electrolyte. This unique design makes them particularly well-suited for specific wheelchair use scenarios, especially for users who face challenging environmental conditions or have specific mobility patterns.
The gel electrolyte design provides exceptional resistance to vibration and shock, making gel batteries an excellent choice if you frequently use your wheelchair on rough surfaces, gravel paths, or outdoor terrain. The gel also prevents acid stratification, which means these batteries maintain more consistent performance over their lifespan compared to traditional flooded batteries. You'll find that gel batteries can handle deeper discharge cycles better than standard lead-acid batteries, though not quite as well as AGM options.
With all that being said, temperature tolerance is where gel batteries really shine for wheelchair users. They perform remarkably well in both hot and cold conditions, maintaining their capacity and performance across a wider temperature range than other battery types. This makes them ideal if you live in areas with extreme weather or if you store your wheelchair in unheated garages or sheds.
However, gel batteries also have some limitations that can affect your wheelchair’s performance. For the most part, they provide less overall range than both lithium and AGM batteries, which might require more frequent charging if you're an active user. The charging process is also more sensitive - gel batteries require specific charging profiles and can be damaged by overcharging more easily than AGM batteries. They also tend to have a shorter overall lifespan than AGM batteries, typically lasting 2-3 years compared to 3-4 years for quality AGM options.
Finally, gel batteries are generally the heaviest option, which can make your wheelchair more difficult to transport and may affect its overall handling characteristics.
Answering Your Top 4 Questions About Wheelchair Batteries
We know you have questions, so we've compiled answers to some of the most common ones we hear about wheelchair batteries.
1. Do electric wheelchairs use lithium batteries?
As we've discussed, not all electric wheelchairs use lithium batteries, but they are a popular and increasingly common option.
Many new models come with lithium batteries as a standard feature, and you can also upgrade to lithium batteries on many older models.
The choice between lithium and other battery types often comes down to a trade-off between performance and cost.
2. Can you take a battery-powered wheelchair on a plane?
Yes, you can take a battery-powered wheelchair on a plane, but there are some restrictions.
The Federal Aviation Administration (FAA) has specific rules for traveling with lithium-ion batteries.
You are generally allowed to bring a wheelchair with a lithium-ion battery, but the battery must not exceed 300 watt-hours (Wh).
If you have a spare battery, it must not exceed 160 Wh.
It's always a good idea to check with your airline before you travel to make sure you understand their specific policies.
3. How do I know if a battery is lithium?
There are a few ways to tell if a battery is lithium.
The easiest way is to check the label on the battery itself.
It should be clearly marked as "lithium-ion" or "Li-ion."
If you can't find a label, you can also try to identify the battery by its weight. Lithium-ion batteries are significantly lighter than lead-acid batteries of the same size.
Finally, you can consult the user manual for your wheelchair, which should specify the type of battery it uses.
4. What happens if I puncture a lithium-ion battery?
Puncturing a lithium-ion battery can be dangerous.
The battery can release flammable electrolytes and may even catch fire or explode.
If you accidentally puncture a lithium-ion battery, it's important to get to a safe distance and call the fire department. Do not try to put out the fire yourself. To avoid punctures, be sure to handle your batteries with care and avoid dropping them or exposing them to sharp objects.