Most RC cars sold in Pakistan use a 3.7V or 7.4V lithium pack charged over USB. Charged properly it lasts 300+ cycles; charged carelessly it swells or dies in a few months. This is the routine that keeps the rechargeable RC cars at cartoys.pk running for years.
| Pack | From empty | Gives |
|---|---|---|
| 3.7V 500 mAh (mini, stunt cars) | 40–60 min | 10–15 min driving |
| 3.7V 800–1000 mAh (1:16 drift, racing) | 60–90 min | 15–25 min |
| 7.4V 1000–1500 mAh (1:12 off-road) | 90–150 min | 20–30 min |
| Charging from the remote | 2–3 hours | Same as above |
Many cars under PKR 6,000 have a short cable that runs from the transmitter to the car. It works, but it drains the remote's AA cells and is slow. If the car also has a USB port, use that instead and save the remote's batteries for driving.
Runs under 5 minutes from full, will not take a charge, or is visibly puffy. Replace it — do not keep using a swollen pack. Replacement packs for common toy cars cost PKR 800–1,500; check the voltage and connector match. More in how long an RC car battery lasts.
Until the indicator shows full — usually 60–90 minutes for a 3.7V pack. There is no need for a long 'first charge'; that advice belongs to old NiCd batteries, not lithium.
Yes, if the car uses a USB cable. Any 5V USB adapter works; fast chargers are fine because the cable's circuit limits current.
Warm is normal. Hot enough to be uncomfortable to hold means a faulty pack or charger — unplug it and stop using that pack.
No. Toy-grade chargers do not always cut off at full, and an overcharged lithium pack swells. Charge while you can check on it.