Batteries
What does the C rating mean on a LiPo battery?
Capacity, voltage and C rating are the three numbers on every LiPo label. The C rating is the one buyers worry about most and the one that matters least on an ordinary RC car.
By Ryder M. · Published October 10, 2026 · Last reviewed
Shock & Servo is reader-supported. If you buy through a link on this page we may earn a commission, at no extra cost to you. It never changes which products we pick or the order we rank them in — the full rules are on our methodology page and our affiliate disclosure.
The C rating is a multiplier on the pack's capacity that describes how much current it can deliver. Multiply the capacity in amp-hours by the C number and you get the maximum continuous discharge in amps. A 5000mAh pack — that is 5 amp-hours — rated at 50C claims 5 × 50 = 250 amps continuous. That is the whole calculation, and the practical conclusion for almost every reader is that the C rating on any hobby pack sold today already exceeds what an ordinary RC car will ever draw.
Direct answer: C rating = maximum discharge current ÷ capacity. Capacity in amp-hours multiplied by the C number gives amps. For a normal 1/10 basher, a 2S or 3S pack at any rating you can buy is sufficient, and capacity — how long it runs — is the number worth choosing on instead.
Working the numbers both ways
| Pack | Capacity | C rating | Claimed continuous current | What draws that |
|---|---|---|---|---|
| Small 1/18 car pack | 750mAh (0.75Ah) | 25C | about 19A | Comfortably more than a small brushed car uses |
| Typical 1/10 pack | 5000mAh (5Ah) | 50C | about 250A | Far beyond a 1/10 brushless system's draw |
| Same pack, lower rating | 5000mAh (5Ah) | 25C | about 125A | Still beyond a 1/10 brushless system's draw |
| Large 6S basher pack | 5000mAh (5Ah) | 50C | about 250A | Relevant territory for a 1/8 6S truck |
Why the number is bigger than the truth
C ratings are unregulated. There is no standards body policing them, no required test method and no penalty for optimism, and the result is exactly what you would expect: the number printed on a cheap pack is a marketing figure rather than a measurement. Two packs both labeled 50C can behave noticeably differently under load, and the more expensive one is usually the honest one. This is why experienced owners pay attention to the brand's reputation rather than the number on the shrink wrap.
It is also why the C rating is a poor way to choose a pack. The number you can trust is capacity in mAh, because it is straightforward to verify and it maps directly onto something you care about — how long the car runs before it slows down. The best 2S LiPo batteries ranks packs on consistency rather than claimed output for exactly this reason.
What to look for instead
- Capacity, in mAh. This sets run time, and run time is the constraint that actually limits an afternoon.
- Physical size. A pack that does not fit the battery tray is useless no matter how good it is. RC car battery sizes covers the common dimensions.
- Connector type. The second most common ordering mistake after size. RC car battery connectors identifies them by sight.
- Cell count. 2S, 3S and so on — this is what changes how fast the car feels, and the speed control has to be rated for it. See 2S vs 3S LiPo.
- Brand consistency. The one place extra money buys something real: a pack that performs the same on its fiftieth cycle as its first.
- C rating. Last. Useful as a sanity check that you have not bought something intended for a radio receiver, and little else on a normal car.
Packs that get this right
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 |  Gens Ace 2S LiPo batteryThe brand most people settle on once they have been burned by a cheap pack that puffed after a month. | The reliable default | 8.7 | |
| 2 | Ovonic 2S LiPo batteryThe sensible middle: better built than the bargain packs, cheaper than the premium ones. | Middle ground | 8.4 | |
| 3 | Zeee 2S LiPo batterySold in twos for about what one premium pack costs — the reason so many garages have a stack of them. | Two packs, low spend | 8.1 |
Illustrative photo — not this exact model.
#1 · The reliable default
Gens Ace 2S LiPo battery
The brand most people settle on once they have been burned by a cheap pack that puffed after a month.
8.7/10our score for this use
LiPo is the standard rechargeable battery chemistry for RC cars: lighter than the older NiMH type and it holds its power right up to the end of the run rather than gradually fading. 2S means two cells — the size most 1/10 cars take.
What it does well
- Consistent pack-to-pack quality, which is the whole argument for paying more for a battery
- Holds voltage under load, so the car feels the same on lap ten as on lap one
- Sold in all the common connector types and sizes
What it does badly
- Costs more than the budget brands for capacity you can measure but may not notice
- Like all LiPo packs it must be stored at partial charge, not full, or it degrades
- Needs a balance charger — it cannot be charged with the wall plug from a toy car
Illustrative photo — not this exact model.
#2 · Middle ground
Ovonic 2S LiPo battery
The sensible middle: better built than the bargain packs, cheaper than the premium ones.
8.4/10our score for this use
A mid-priced LiPo brand that has built a reputation for reliability without the premium price. For a car that gets used on weekends rather than raced, this is the tier that makes sense.
What it does well
- Noticeably better built than the cheapest packs on the shelf
- Widely available in the common sizes and connectors
- Good value if you want two packs instead of one premium pack
What it does badly
- Not the last word in performance if the car is being raced
- Quality is consistent but not at the level of the top-tier brands
- Still requires a proper balance charger
Illustrative photo — not this exact model.
#3 · Two packs, low spend
Zeee 2S LiPo battery
Sold in twos for about what one premium pack costs — the reason so many garages have a stack of them.
8.1/10our score for this use
The budget end of the LiPo market, usually sold as a two-pack. For a gift where the goal is more driving time rather than maximum performance, two adequate batteries beat one excellent one.
What it does well
- Two-packs at a price that makes a spare battery an easy decision
- Perfectly adequate for bashing, which is what most of these cars do
- Widely stocked in the common sizes
What it does badly
- Pack-to-pack consistency is not at the level of the premium brands
- They tend to age faster if they are stored fully charged — which beginners do
- Not the choice for racing
When the C rating does start to matter
There is a real case, and it is at the top of the hobby. A 1/8 six-cell basher with a large brushless motor and aggressive gearing genuinely can pull current in the range where a weak pack sags — the voltage drops under load, the car feels flat, and the pack gets hot. Racers meet the same problem for a different reason: they are at full throttle far more of the time than a basher is, so sustained output matters rather than peak. In both cases the fix is a reputable pack, not a bigger printed number.
The symptom to watch for is heat. A pack that is warm after a run is normal; a pack that is uncomfortably hot is being asked for more than it can comfortably give, and that shortens its life quickly. If that is happening, the answer is a better pack or softer gearing — and if the car is being geared for more speed, how to make an RC car faster covers the trade-offs honestly.
The other number on the label: charge rate
Some packs also print a charge C rating, and that one is worth reading. It tells you how fast the pack may be charged — 1C means at the same number of amps as its capacity in amp-hours, so a 5000mAh pack at 1C charges at 5 amps. Charging faster than the pack is rated for shortens its life and is one of the few genuinely risky things a beginner can do with a balance charger. How long to charge an RC car battery does the arithmetic, and how to store LiPo batteries covers what to do when the run is over.
How we assembled this guide
The arithmetic above is the standard definition of the C rating — capacity in amp-hours multiplied by the C number gives current in amps — and every figure in the table is that calculation applied to common pack sizes, not an estimate of any particular product's measured output. We have stated plainly where manufacturers' claimed figures are unverifiable, because they are. No price figures appear anywhere on this site. We do not test these products first-hand; our methodology page explains what that means.