How long does a 4000mAh 2S pack last?
A 4000mAh 2S LiPo lasts about 10 minutes at a 20 A average draw (1/10 2wd brushless, mixed driving), using 80 percent of capacity. It holds 29.6 Wh at 7.4 V, and charges from a normal run in about 108 minutes at 2 A.
CNHL 4900mAh 2S Shorty Lipo Battery 7.4V 120C with 5mm
- 2S
- 4900mAh
The closest current 2S listing to 4000mAh in our catalog. Check the plug and the battery tray size before ordering.
$71.99 listed price, changes often
Check price on AmazonHow long does 4000mAh 2S last by car type?
| Car and driving | Average draw | Runtime |
|---|---|---|
| 1/10 crawler, trail pace | 5 A | 38 min |
| 1/10 2WD brushed truck | 12 A | 16 min |
| 1/10 2WD brushless, mixed driving | 20 A | 10 min |
| 1/10 4x4 brushless bashing | 25 A | 8 min |
The draws are typical averages over a run, not peaks. Launches and wheelies pull several times more for a moment. Runtime = 4 Ah x 0.8 usable / average amps x 60. Try your own figures in the LiPo runtime calculator.
How much current can a 4000mAh pack deliver?
| C rating | Max continuous |
|---|---|
| 50C | 200 A |
| 100C | 400 A |
How long does a 4000mAh 2S pack take to charge?
| Charger current | From 80% used |
|---|---|
| 1 A | 215 min |
| 2 A | 108 min |
| 5 A | 43 min |
1C for this pack is 4.0 A. Charge at or below 1C unless the pack label allows more. Details in the charge time calculator.
Other pack sizes on 2S
- 2200mAh 2S: about 5 min
- 3000mAh 2S: about 7 min
- 5000mAh 2S: about 12 min
- 5200mAh 2S: about 12 min
- 6000mAh 2S: about 14 min
- 6500mAh 2S: about 16 min
- 7600mAh 2S: about 18 min
- 8000mAh 2S: about 19 min
Packs, a charger and a LiPo bag
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Frequently asked questions
How long does a 4000mAh battery last in an RC car?
At 2S it depends almost entirely on average current draw. 1/10 crawler, trail pace: about 38 minutes; 1/10 2WD brushed truck: about 16 minutes; 1/10 2WD brushless, mixed driving: about 10 minutes; 1/10 4x4 brushless bashing: about 8 minutes. These use 80 percent of the rated capacity, which is the safe depth of discharge for LiPo packs. Bigger tires, taller gearing and grass all raise the draw and shorten runtime.
What C rating do I need for a 4000mAh 2S pack?
Maximum continuous current is capacity in amp hours times C. At 4000mAh a 50C pack is rated for about 200 A and a 100C pack for 400 A. Real draw in most cars is far lower, so a quality 50C pack is plenty for 1/10 bashing; the higher rating mostly means less voltage sag and a cooler pack.
RCCarCalc is researched guidance, not professional advice. Figures come from published manufacturer specifications, listings and verified owner reports, not hands-on testing. Speeds are theoretical or as listed; real results depend on gearing, battery, tires and terrain. See how we research.