EV Battery Degradation Explained for Drivers in Indonesia

The battery is the most expensive part of an electric vehicle (battery electric vehicle, or BEV), so it is fair to ask how quickly it wears out. The short answer surprises many people: in large real-world studies the loss is slow, often around 1 to 2% of capacity a year, and most used EVs still hold the large majority of their range after years on the road. This guide is about the data and the why, not a list of tips. It explains how a battery actually ages, what the fleet studies found, what habits speed aging up, and why two cars in Indonesia can age at different rates depending on whether they use an LFP or an NMC battery. For the practical do-this habits, the battery care guide is the companion to this one.

By mht-dev, Frontend Engineer & Creator

A frontend engineer who bought a first electric car in March 2026 and built EV Charge Calculator while working out the real cost of charging it, writing every guide from an everyday new EV owner's perspective.

How slowly an EV battery really loses capacity

The most useful evidence comes from large fleets, where thousands of cars are measured rather than a handful of anecdotes. One widely cited analysis by the telematics company Geotab looked at more than 22,700 electric vehicles across about 21 models. Its readings put average capacity loss at roughly 1 to 2% a year, with a 2026 update reporting an average near 2.3% a year, which works out to a battery keeping somewhere around 80 to 90% of its original capacity after eight years of normal use. In plain terms, the typical battery does not fall off a cliff. It fades a little each year, and most owners barely notice the change from one year to the next.

A second body of evidence comes from the used-car side. A Swedish used-car marketplace, Kvdbil, measured the battery state of health of more than 1,300 used electric and plug-in hybrid cars and found that roughly 8 in 10 still retained over 90% of their original health. That matters because used EVs are exactly the cars buyers worry about most. The numbers say the worry is mostly misplaced: a used EV with sensible mileage is very likely to have a strong battery. Manufacturers back this up with a warranty, commonly about eight years or 100,000 miles to a capacity floor that is usually 70%, so the carmaker itself is betting the pack will stay well above that line for years.

Calendar aging and cycle aging: the two ways a pack wears

A lithium-ion pack ages in two ways at once. Calendar aging is the loss that happens simply with the passage of time, even if the car barely moves. It is driven mostly by temperature and by how full the battery sits while it rests: a pack kept hot and near 100% ages faster than one kept cool and around half full. Cycle aging is the loss from actually using the battery, that is, the throughput of charging and discharging as you drive and recharge. Every full charge and discharge equivalent adds a little wear. Real batteries experience both at the same time, which is why a car that sits fully charged in the heat and is also fast charged hard will fade faster than one that is used gently and parked cool.

The fleet data lines up with this picture. In the Geotab analysis, the cars that leaned heavily on high-power DC fast charging, above roughly 100 kW for a large share of their sessions, degraded at up to about 3.0% a year, while cars that mostly charged on AC or lower power sat closer to about 1.5% a year. Hot operating regions added something like 0.4% a year on top. None of these figures are alarming on their own, but together they show the levers clearly: time at high charge, heat, and the share of hard fast charging are what move a battery from the slow end of the range toward the faster end. The everyday levers that pull a pack back toward the slow end, such as a daily charge limit and parking cool, are the subject of the battery care guide rather than this one.

Why LFP and NMC batteries age differently

Not all EV batteries are the same chemistry, and the chemistry changes how the pack ages and how you should treat it. Two types dominate. LFP (lithium iron phosphate) is robust and stable: it tolerates being charged to 100% regularly and is relatively relaxed about sitting at a high state of charge, which is why many cars with LFP packs are happy to be charged full every day. NMC (nickel manganese cobalt) packs more range into the same weight but are more sensitive to time spent full and to heat, which is why many NMC cars set a default daily charge limit around 80% and keep 100% for trips. Neither is better in every way: LFP trades a little range and cold-weather performance for durability and a daily-100% habit, while NMC trades that easygoing daily routine for more range per kilogram.

For a driver in Indonesia, the chemistry of your car tells you which advice fits you. If your car uses LFP, charging to 100% for daily use is generally fine and often even recommended, so the high-state-of-charge concern is much smaller. If your car uses NMC, the gentler daily routine matters a little more. Either way the underlying mechanism is the same one described above: heat and prolonged high charge are the stressors, and the chemistry only changes how sensitive your pack is to them. You can usually find your car's chemistry in the brochure, the owner forum, or the spec sheet, and the per-vehicle pages on this site note it where it is known. To turn all of this into a short set of daily habits, read the battery care and charging tips guide, and for the heat angle in particular, see the guide on how temperature affects EV charging.

Frequently asked questions

How much does an EV battery degrade per year?

Large fleet studies put the typical loss at around 1 to 2% of capacity a year for normal use. One analysis of more than 22,700 EVs reported an average near 2.3% a year in its 2026 update, which still leaves a battery with roughly 80 to 90% of its original capacity after eight years. The rate varies with how the car is used: heavy high-power DC fast charging and hot climates push it toward the faster end, while mostly AC charging and a cool, moderate routine keep it toward the slower end. The figures vary by model and conditions, so treat them as a typical range rather than a guarantee for any one car.

What causes an EV battery to lose capacity faster?

Three things stand out. First, heat: high temperatures speed up the chemical aging that happens even when the car is parked. Second, sitting at a high state of charge for long periods, since a pack left near full ages faster than one kept around half full. Third, heavy reliance on high-power DC fast charging; in the fleet data, cars that fast charged hard for a large share of sessions degraded noticeably faster than cars that mostly used AC. These map onto the two aging types: heat and resting charge drive calendar aging, while charging throughput drives cycle aging. Occasional fast charging is fine and expected; it is the habitual, hot, always-full pattern that adds up.

Is it true most used EVs still have a healthy battery?

Yes, for the large majority. A Swedish used-car study that measured the battery state of health of more than 1,300 used electric and plug-in hybrid cars found that roughly 8 in 10 still retained over 90% of their original health. That is consistent with the fleet data showing slow, gradual loss rather than a sudden collapse. It is still worth checking the state of health of any specific used car before buying, because individual history varies, but as a rule a used EV with reasonable mileage is very likely to have a strong battery, and the manufacturer warranty usually covers the pack to about a 70% capacity floor for around eight years or 100,000 miles.

Do LFP and NMC batteries degrade differently in Indonesia?

Yes. LFP (lithium iron phosphate) is the more durable chemistry for daily use: it tolerates being charged to 100% regularly and is relaxed about sitting at a high state of charge, so for an LFP car a daily full charge is generally fine. NMC (nickel manganese cobalt) offers more range per kilogram but is more sensitive to time spent full and to heat, which is why many NMC cars default to about an 80% daily limit. In a warm climate like much of Indonesia, the heat sensitivity of NMC is a little more relevant, but the difference is modest, and both chemistries are designed to last the life of the car. The underlying mechanism is the same for both; the chemistry only changes how sensitive the pack is to heat and a high resting charge.

Does fast charging ruin an EV battery?

Not from occasional use. EVs are built to fast charge, and a road trip with several DC stops is exactly what the car is designed for. What the data shows is a difference of degree: cars that relied heavily on high-power DC fast charging for a large share of their sessions aged somewhat faster than cars that mostly charged on AC, on the order of 3% a year versus around 1.5% a year in one large study. So fast charging when you need it is fine; making high-power DC your everyday default, especially in heat and to a full battery, is the pattern that adds extra wear over the years. Day to day, charging at home or on slower AC is gentler on the pack.