WEIZE 12V 35AH Deep Cycle Battery Review: solid workhorse for scooters, chairs and small RV setups

I’ve been using this WEIZE 12V 35AH deep cycle battery pack (the 2‑battery set) for a while now, mainly in a mobility scooter and as a backup power source in a small camper setup. I’m not an electrician, just someone who got tired of nursing half‑dead batteries and wanted something that would simply hold a charge and power my stuff without drama. This is a basic sealed lead-acid setup, nothing fancy, but that’s kind of the point.

The first thing you notice is the weight. Together, these two batteries are no joke to move around. If you’re used to lithium, you’re going to swear a bit the first time you carry them. But in exchange, you get a decent chunk of capacity for the price, and they’re compatible with a lot of scooters and chairs that were designed around lead-acid from the start. For my Pride-style scooter, they slotted in without any weird adapters.

Day to day, what matters is whether your scooter or chair turns on and stays on. In practice, these batteries did that. I could leave the scooter parked for a couple of weeks, come back, and it still powered up without that sinking feeling you get when the old batteries are already sagging. Compared to the tired OEM set they replaced, the difference in runtime and confidence was pretty noticeable.

They’re not perfect: they’re heavy, they’re not lithium, and if you abuse them (never charge them, drain them to zero all the time), they’ll die like any other lead-acid. But for the price and the type of use they’re aimed at—scooters, wheelchairs, small RV tasks—they’re a pretty solid compromise between cost, capacity, and reliability. That’s basically how I’d sum them up: not fancy, but they get the job done without costing a fortune.

On the value side, the WEIZE 12V 35AH 2‑pack sits in a sweet spot. You’re not paying premium brand prices, but you’re also not diving into the absolute bargain-bin mystery batteries. For the capacity you get—70AH total at 12V if used in parallel, or 35AH at 24V in series for a chair/scooter—the cost per amp-hour is pretty hard to argue with. If you just want your scooter or power chair back in action without dropping hundreds on lithium, this is a sensible choice.

Compared to OEM mobility batteries from some wheelchair brands, these are usually much cheaper, and in my case, they performed at least as well, if not slightly better, than the originals when they were new. The main trade-off is weight and chemistry. If you want lighter, longer-lasting, and more cycles, you go lithium and pay a lot more up front, possibly needing a different charger or system tweaks. If you just want something that works with your existing setup and doesn’t hammer your wallet, these WEIZE units hit that middle ground.

Where the value can drop is if you’re using them for heavy RV or off-grid solar use and cycling them hard every single day. In that scenario, you’d probably be better off investing in bigger capacity or lithium from the start because you’ll chew through lead-acid faster. But for mobility scooters, power chairs, small RV backup, or UPS/emergency use, the balance of price, performance, and reliability is solid. You’re basically paying for a sturdy workhorse, not a fancy tech upgrade.

So, in plain terms: if your use is light to moderate and you’re okay with the weight, the value is strong. If you’re planning to live off-grid on these things or you want something ultra-light and long-lived, then it’s probably worth saving up for lithium instead. For most everyday users who just need their scooter or trailer to have dependable power again, this WEIZE 35AH 2‑pack is good value for money and feels like a sensible, no-nonsense purchase.

Design-wise, there’s nothing flashy here, and that’s fine. These WEIZE 35AH units are standard sealed lead-acid bricks in a tough black case. No handles on this specific capacity like you see on some larger batteries, which I did miss when lifting them into the scooter bay. The screw terminals are the main design detail that actually matters: they’re decent quality, threads felt clean, and the included bolts with washers and lock washers made it easy to get a tight, solid connection without the cables wiggling loose.

Polarity is clear: positive on the left, negative on the right when you’re facing the printing. That might sound minor, but on some cheaper batteries I’ve used, the markings are faint or offset, and you end up double-checking three times before tightening anything. Here it’s obvious enough that you can work quickly without second-guessing yourself. The posts also sit at a good height—low enough that they don’t bump the compartment lid, high enough to get a ring terminal and washer on comfortably.

One thing I noticed is the case feels solid and rigid. I’ve had some budget SLA batteries where the plastic felt thin and flexed when you squeezed the sides. These don’t give that impression. I moved them in and out of the scooter a few times, and they knocked around a bit when I first messed up the alignment of the tray. No cracking, no bulging, no weird noises. For something that’s going to live in a scooter or RV compartment and get bumped around, that toughness matters more than looks.

If I had to complain about the design, it would be the lack of built-in carrying straps on this size. At 40+ pounds for the pair, you really feel it when you’re crouched down trying to drop them into a tight compartment. A simple top strap on each battery would make handling a lot nicer, especially for older users or anyone with back issues. Still, as a whole, the design is functional and practical. Nothing fancy, but nothing that feels cheap or badly thought out either.

On paper, each unit is a 12V, 35AH sealed lead-acid deep cycle battery. Two in series give you 24V for most electric wheelchairs and scooters, which is how I used them. The actual measured capacity is always a bit of a mystery unless you bench test them, but based on runtime in the scooter compared to my old 33AH pair, the 35AH rating seems realistic enough. They’re clearly not some “label only” specials; they behave like proper deep cycle batteries, not just starter batteries in disguise.

Out of the box, they arrived at around 12.7–12.8V, which is basically a storage charge. I hooked them up to a standard smart charger meant for sealed lead-acid, and they went up to around 13.4–13.6V in float mode. No overheating, no odd smells, nothing funky. The key point: use the right charger. If your scooter or wheelchair has its original charger in good condition, you’re fine. If you’re charging externally, make sure it’s compatible with sealed lead-acid and doesn’t overcharge. Cooked batteries die fast, and that’s not the battery’s fault.

In day-to-day use, voltage drop under load felt normal. Climbing ramps or small hills, the scooter’s battery gauge dipped but didn’t nose-dive the way it did with the worn-out pack. After a full day of moderate use, plugging back in brought them up to full in a few hours. I never noticed any big imbalance between the two batteries when checking voltages in series, which is a good sign that both units are aging at the same pace.

One important detail: these are AGM-style sealed batteries, so they’re maintenance-free. No messing with water levels, no venting fumes into your living space. You can mount them in typical scooter and RV compartments without worrying about acid leaks as long as you don’t physically abuse them. Just be realistic: they’re heavy, they don’t like being fully drained, and they don’t have the cycle life of a lithium pack. But if you treat them halfway decently and keep them charged, you’ll get solid, predictable battery behavior at a much lower upfront cost than going lithium.

Durability is always the big question with budget-friendly batteries. So far, with regular use in a scooter and occasional RV duty, these WEIZE 35AH units have held up better than I expected for the price. No swelling, no weird smells, no cracked cases, and no sudden loss of capacity. I’m not babying them, but I’m also not abusing them: I try not to run them flat and I keep them on a proper charger when the scooter is parked for more than a few days.

Physically, they’ve taken some bumps. Getting them in and out of the scooter compartment isn’t graceful, and I’ve knocked them around on the concrete once or twice during installation. The casing still looks fine. No chips or fractures, and the terminals haven’t loosened or stripped. That gives me some confidence they can handle the vibrations and minor impacts that come with being mounted on a scooter or in a trailer bouncing down the road.

From what I’ve seen and from other users’ feedback, the main durability risk is cell failure after several months in some units. One reviewer mentioned a battery that started self-discharging after around eight months in an RV. The upside is that WEIZE/Arkpower support seems to actually respond and replace defective units, which is more than I can say for some random off-brand batteries I’ve bought in the past. It doesn’t cancel the hassle, but at least you’re not stuck eating the full cost if you get a bad one.

Realistically, you’re not buying top-tier industrial batteries here. You’re getting a decent deep cycle option that should last a couple of years or more if treated properly. If you constantly drain them to near zero, leave them discharged for weeks, or use a junk charger, they’ll die early—just like any other SLA. Treat them reasonably, and durability is good enough for everyday mobility and light RV use. Not tank-like, not indestructible, but solid for the money.

In practice, performance is where these WEIZE batteries either make sense for you or not. I used the pair mainly in a Pride-style mobility scooter and occasionally as a 12V source in a small RV setup. With the scooter, the upgrade from tired old OEM batteries to these 35AH units was obvious. I went from worrying about range after a couple of short trips to comfortably doing my usual errands and still having plenty of charge left. I’m not counting miles with a GPS or anything, but runtime roughly felt 30–40% better than the worn-out set I pulled out.

What really stood out was how well they hold charge when not in use. I could park the scooter for one to two weeks, come back, and it still powered on and drove like normal. With my old batteries, after a week of sitting, the charge meter would drop fast and the scooter felt weak, sometimes even cutting out on small inclines. With these, the voltage sag under load is much less dramatic. As long as I kept up with regular charging (plugging in after each day of use or every few days when barely used), they stayed consistent.

I also tested one of the batteries in a small RV as a house battery, connected to a basic solar charger. There, the performance was decent but you do see the limits of 35AH pretty quickly if you run lights, a water pump, and charge devices. This isn’t a big off-grid battery. It’s more suited to light duty or backup. Still, it handled several hours of LED lights and phone charging in the evening without dropping into the danger zone, and when the sun came up the next day, the solar panel topped it back up without issues.

To be fair, this is still lead-acid, so if you constantly drain it very low, you’ll shorten its life. It’s not as forgiving as lithium. I tried to keep it above 50% most of the time, and that’s probably why I haven’t seen any major capacity loss so far. Some users mention cell failures after several months, but the seller seems to handle those cases under warranty. For my use, performance has been stable and predictable. Not mind-blowing, but for the price and chemistry, it does what it’s supposed to do: provide reliable, steady power for mobility and light RV tasks.

This kit is very straightforward: you get two 12V 35AH sealed lead-acid batteries, model LFP1235, with screw terminals and the mounting screws included. No cables, no harness, no fancy extras. If you’re swapping these into a scooter or chair, you usually just reuse your existing wiring and brackets. The product page talks about a lot of possible uses—mobility scooters, power chairs, small homemade electric vehicles, solar storage, trolling motors, RVs, backup power. That’s not marketing fluff; they’re just standard 12V SLA blocks, so they’re pretty versatile as long as you know what you’re doing.

Each battery is roughly in the 7.7 x 5.1 x 7.1 inch range, so before buying I had to measure the battery compartment on my scooter to make sure they’d fit. They replaced a pair of 33AH units, and as advertised, the 35AH dropped right in without needing to modify anything. If your old batteries are something like 31–36AH U1 size, chances are these will match up, but I’d still say: measure first, order second. Saves a headache.

The labeling on the batteries is clear enough. Polarity is marked, and the terminals are the standard screw-type posts: left positive (red) and right negative (black) when facing the label. That made the swap easy because the original scooter cables lined up without stretching or crossing. Voltage out of the box was around 12.7–12.8V on both units, which is pretty normal for new sealed lead-acid batteries that have been sitting on a shelf.

Overall, in terms of presentation and what’s in the box, it’s pretty no-nonsense. No manual worth mentioning, no hand-holding, so if you’ve never changed a battery before, you might want to watch a quick video or get help from someone who has. But if you’ve ever messed with car or scooter batteries, everything here feels familiar. It’s basically a generic deep cycle form factor, sold under the WEIZE brand, with the main selling point being capacity per dollar and wide compatibility with common mobility and RV gear.