- Top Pick: Mighty Max Battery, ML35-12 – 12 Volt 35 AH SLA Battery – Pack of 2
- Best Value: VATOSO 24V12AH Battery for Electric Wheelchair, Built-in 30A BMS, for 100W-500W, Includes 2A Charger Anderson Connector (24V12AH)
- Premium Choice: Casil 12V 33Ah SLA AGM Battery – 2 Pack Replacement for Jazzy Power Wheelchairs, Mobility Scooters, and Solar Storage Systems – Deep Cycle Sealed Battery for 24V Applications
When a power chair starts losing range, the instinct is to blame the motor or the controller. More often the culprit is a pair of worn batteries that can no longer hold a charge. Picking replacements is not like picking AA cells: voltage, amp-hour capacity, terminal style and chemistry all have to match the chair, and a wrong guess can leave the user stranded or damage the electronics. The decision behind this keyword is whether to stay with sealed lead acid (SLA) pairs or move to a lithium pack.
This 2026 guide is for caregivers, owners of Jazzy-style chairs and anyone replacing a worn set on a mobility scooter. It compares eight listings: six sealed lead acid options and two 24V lithium packs. One lithium listing in the source set, a 12V 20Ah pack described for lighting, power wheel toys and fish finders, was left out because its title never mentions wheelchairs. Always confirm fit against your chair’s manual before ordering, and when in doubt, ask the chair’s maker or a mobility dealer which battery group, terminal style and capacity the frame was built around. A few minutes of checking beats a return shipment of a heavy battery.
Quick Picks
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| Product | Best for | Key spec from the title |
|---|---|---|
| Mighty Max ML35-12 Pack of 2 | Standard 24V chair pair | 12 volt 35 AH SLA, two batteries |
| VATOSO 24V 12AH Lithium | Lighter lithium swap | 24V, built-in 30A BMS, 100W to 500W |
| Casil 12V 33Ah AGM 2-Pack | Jazzy replacement | 12V 33Ah SLA AGM, deep cycle |
| Hoveround MPV5 Set (SigmasTek) | Hoveround chairs | 2 x 12 volt 35AH |
| Mighty Max ML35-12 for Jazzy Select | Pride Jazzy Select | 12V 35AH, 2 pack, Jazzy Select named |
| Mighty Max ML35-12 Single | Replacing one battery | 12 volt 35 AH SLA, single unit |
| SEENRONGYUAN 24V 12Ah Lithium | Higher-watt motors | 30A BMS, 100W to 750W motors, charger |
| Mighty Max ML18-12 Pack of 2 | Lighter, smaller chairs | 12 volt 18 AH SLA, two batteries |
How to Choose
Voltage and how pairs are wired
Most power chairs run at 24V, built from two 12V batteries wired in series. That is why the SLA listings come as pairs, and why a single battery, like the lone ML35-12, only makes sense when one of an otherwise healthy pair has failed. The lithium listings from VATOSO and SEENRONGYUAN are single 24V packs that replace both lead acid units. Never mix 12V and 24V parts, and confirm your chair’s system voltage first, usually printed on the controller or in the manual.
Capacity in amp-hours
Multiply voltage by amp-hours to get watt-hours. A 12V 35Ah battery holds 420 watt-hours, so a pair offers 840 watt-hours at 24V; a 24V 12Ah lithium pack holds 288. A lower amp-hour figure usually means a shorter range between charges, so compare totals rather than single-battery numbers. Use the chair’s original battery size as the baseline and avoid going lower if range matters.
SLA versus lithium, charger and BMS
Sealed lead acid is heavy but familiar and fits most chairs without modification. A pair of 35Ah units is a real load to lift, so factor in who will do the swap and where the old batteries will go. Lithium packs are lighter, include a built-in battery management system (BMS) rated at 30A in both titles here, and come with a 2A charger and Anderson connector. A lead acid charger is not a drop-in match for lithium chemistry, so check that the charger and connector suit your chair. Lead acid terminals vary, so confirm the posts match your cable ends.
Fit, motor wattage and what to ignore
Physical size matters; a battery that does not fit the tray or the cable reach is useless. Lithium listings give motor wattage ranges, such as 100W to 500W for VATOSO and up to 750W for SEENRONGYUAN, so compare them with your chair’s motor label. Ignore generic claims of universal fit, and ignore listings for other uses such as solar storage or toys unless the seller confirms wheelchair compatibility. Replace batteries in matched pairs of the same age and capacity, and skip any listing that does not name voltage and amp-hours.
The 8 Best Options
Mighty Max ML35-12 Pack of 2
Two 12 volt 35 AH SLA batteries, which together form a 24V system. The title does not name a specific chair, so this is for owners who already know their chair takes this size and want a straightforward pair.
- Strength: 35 AH capacity per battery is among the larger SLA sizes here.
- Strength: sold as a pair, matching the standard series arrangement.
- Trade-off: the title says nothing about wheelchair fitment.
Skip it if you need a listing that names your chair model. Check terminal type and tray size against the old batteries first, and read the chair’s manual for the required battery size. Owners who replace a worn pair of the same model number will find this the easiest like-for-like match.
VATOSO 24V 12AH Battery for Electric Wheelchair
A single 24V 12Ah lithium pack with a built-in 30A BMS, meant for 100W to 500W motors, with a 2A charger and Anderson connector included.
- Strength: one pack replaces two lead acid batteries.
- Strength: charger and connector are part of the package.
- Trade-off: 12Ah gives a smaller capacity than a 35Ah pair, and a 288 watt-hour total suggests shorter range.
Skip it if your motor exceeds 500W or if you need the biggest capacity. It is a candidate for lighter chairs and short daily trips, and the included charger means one less accessory to hunt for. Because lithium packs follow different charging rules, keep the supplied charger with the battery.
Casil 12V 33Ah SLA AGM 2-Pack
A pair of 12V 33Ah sealed AGM deep cycle batteries described as replacements for Jazzy power wheelchairs and mobility scooters, with a note about 24V applications.
- Strength: AGM sealed design and a Jazzy replacement note.
- Strength: deep cycle construction suits repeated discharge.
- Trade-off: 33Ah is slightly below the 35Ah group, so range may be a bit shorter.
Skip it if your chair needs 35Ah or if you want a named chair model. The title also mentions solar storage and mobility scooters, so confirm wheelchair compatibility with the seller or the chair maker. It suits owners who prefer an AGM design and a pair sold together.
Hoveround MPV5 Wheelchair Battery Replacement Set (SigmasTek)
Two 12 volt 35AH batteries sold as a replacement set for the Hoveround MPV5, made by SigmasTek.
- Strength: names a specific chair, which reduces guesswork.
- Strength: 35AH per battery, sold as a set of two.
- Trade-off: designed for one chair family, so it helps little elsewhere.
Skip it if you do not own a Hoveround MPV5. Owners of other chairs should look at listings naming their own model. Matching the model name removes the guesswork about tray size, cable length and terminal type, which is the main appeal of a chair-specific set.
Mighty Max ML35-12 for Pride Jazzy Select Electric Wheelchair, 2 Pack
The same 12V 35AH size, this time tagged for the Pride Jazzy Select, sold as a pair.
- Strength: a named chair fitment on the listing.
- Strength: two batteries ready for a 24V system.
- Trade-off: aimed at one chair line, so check yours is on the list.
Skip it if you own a different brand. Owners of Jazzy chairs should still compare the tray size and posts with the original batteries. Even a named fitment should be checked against the physical battery before the old pair is discarded.
Mighty Max ML35-12 Single Battery
One 12 volt 35 AH SLA battery from Mighty Max.
- Strength: handy when only one battery of a pair has failed.
- Strength: the same model number as the packs, easy to match.
- Trade-off: mixing a new battery with an old one can shorten the new unit’s life.
Skip it if the pair is older than a year or two. Buyers who need both should buy the two-pack instead. A technician can often tell which battery in a pair has failed, so ask before buying a single replacement.
SEENRONGYUAN 24V 12Ah Lithium Battery for Wheelchair
A 24V 12Ah lithium pack with a 30A BMS for motors from 100W up to 750W, sold with a 29.4V 2A charger and Anderson connector, and positioned as a replacement for lead acid batteries.
- Strength: supports a wide motor range, up to 750W.
- Strength: includes charger and Anderson connector.
- Trade-off: 12Ah capacity is modest next to a 35Ah lead acid pair.
Skip it if you need long range from a single charge. Check the chair’s controller accepts a lithium pack before swapping. The 29.4V charger in the title shows this pack uses a different charging profile from lead acid, so never plug it into the old charger.
Mighty Max ML18-12 Pack of 2
Two 12 volt 18 AH SLA batteries.
- Strength: smaller 18 AH size for compact chairs.
- Strength: sold as a pair for a 24V system.
- Trade-off: lower capacity than the 35 AH models means less range.
Skip it if your chair was built for 35 AH batteries. The title does not mention wheelchairs, so confirm the size fits your tray. It may suit lighter scooters or compact chairs designed around an 18 AH battery, and it works poorly as a swap into a chair built for 35 AH.
Which One Fits Your Situation
You own a Hoveround MPV5
The SigmasTek replacement set names your chair and comes as two 35AH batteries, so there is no sizing puzzle to solve and nothing extra to order.
You own a Pride Jazzy Select
The Mighty Max ML35-12 two-pack for the Jazzy Select is the direct match, with Casil as an alternative.
You want lighter weight
The VATOSO or SEENRONGYUAN lithium packs replace both lead acid batteries with a single unit and include a charger.
One battery died
The single ML35-12 can fill the gap, but replacing both is the safer path for an older pair, since a fresh battery wired to a tired one is held back by its partner.
Common Mistakes
- Ordering one battery for a pair that is several years old, then watching the weaker partner drag the new one down.
- Reusing a lead acid charger on a lithium pack.
- Choosing a smaller amp-hour size and then wondering why range dropped.
- Ignoring terminal type and tray size until the battery arrives.
- Buying a 24V lithium pack for a chair whose motor is above the listed wattage range.
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Frequently Asked Questions
Why do wheelchairs use two batteries?
Most chairs need 24V, and two 12V batteries wired in series provide it. That is why replacements are sold in pairs.
Can lead acid be swapped for lithium?
Often yes, but the controller, charger and connector must be compatible. Read the listing and your chair’s manual first.
Is a higher amp-hour figure better?
Higher capacity generally means longer range, as long as the battery fits the tray and the charger can handle it. Always keep voltage the same as the original and only change capacity within what the manual allows.
Can these batteries go on a plane?
Airlines have separate rules for sealed lead acid and lithium packs, including watt-hour limits; a 24V 12Ah pack works out to 288 watt-hours by simple arithmetic. Contact the carrier well before travel.
