- Out of stock
7.4V 420mAh 2S LiPo Battery 25C Molex
• Specifications: 41 × 20 × 15mm / 1.60 × 0.78 × 0.60in; 23g / 0.81oz; 420mAh; 7.4V (2S LiPo); 25C continuous discharge; Molex plug.
• Designed for FMS FCX24 Atlas: This 2S 420mAh LiPo battery is a direct replacement for the stock battery in the FMS FCX24 Atlas, a 1/24-scale RC rock crawler. The 25C rating (~10.5A continuous) matches the draw of the FCX24's toy-grade ESC and motor, delivering consistent power through climbs, rock crawling, and full-throttle without voltage sag.
• Also Compatible With: Any 1/24-scale RC crawler, buggy, or truggy that uses a 7.4V (2S) LiPo pack with a Molex connector and a battery bay fitting 41 × 20 × 15mm. Not suitable for 1/18 or 1/10 scale vehicles — the dimensions and plug type do not match.
• FCX24 Atlas vs SCX24: The FMS FCX24 Atlas and the AXIAL SCX24 are two competing 1/24-scale RC crawlers. The FCX24 uses a Molex plug; the SCX24 uses a PH2.0 plug. Even if dimensions are similar, the connectors are NOT interchangeable. Verify your car's plug type before ordering.
⚠️ Before Ordering — Verify 2 Things:
• 1) Your RC car's battery bay fits 41 × 20 × 15mm (including Molex plug clearance).
• 2) The battery plug is Molex (two-pin, standard Molex housing). If either doesn't match, this pack will not fit without an adapter.
• Package: 3× 2S 420mAh 7.4V 25C LiPo batteries (Molex plug), 1× USB charger cable, 1× retail carton, 1× user manual.
Frequently Asked Questions
Is this battery compatible with the FMS FCX24 Atlas?
Yes. This 2S 420mAh 7.4V LiPo battery with a Molex plug is a direct stock-capacity replacement for the FMS FCX24 Atlas (1/24-scale RC rock crawler). The 7.4V voltage, Molex plug, and 41 × 20 × 15mm dimensions all match the FCX24’s battery bay. No modification needed.
Is this battery compatible with the AXIAL SCX24?
No. The SCX24 uses a PH2.0 connector, not a Molex plug. Even though both are 1/24-scale RC crawlers with similar battery bay sizes, the plug type and pin pitch are different. For the SCX24, order our 2S 660mAh or 2S 1150mAh PH2.0 versions instead.
What is a Molex plug? How is it different from PH2.0, JST, or XT30?
Molex on this pack is a two-pin connector with a standard Molex housing. It is NOT interchangeable with PH2.0 (2.0mm pin pitch, narrower housing), JST (wider housing, different pin spacing), PH2.54 (wider 2.54mm pitch), XT30 (larger two-pin with different shape), or any other plug type. Remove the stock battery from your car, look at the plug housing shape and pin spacing, and match it to the plug on this pack before ordering.
What does 25C mean for this battery?
25C means this pack safely sustains approximately 10.5A continuous discharge (420mAh × 25C). For a 1/24-scale toy-grade RC crawler like the FCX24 Atlas, this comfortably covers the draw of the stock ESC and motor. If you plan to upgrade to a higher-power ESC or motor that draws over 15A sustained, this pack will not be sufficient.
Can I use this battery in other RC cars?
Yes, if the vehicle uses a 7.4V (2S) LiPo battery with a Molex connector and the battery bay fits 41 × 20 × 15mm. It works with other 1/24-scale toy crawlers, buggies, and truggies that use a Molex plug. It is NOT suitable for 1/18 or 1/10 scale vehicles — the dimensions and plug type do not match.
How do I charge this battery?
This pack includes a USB charger cable. Plug one end into a USB power source (wall adapter, power bank, or PC USB port rated 5V / 1A minimum) and the other into the car’s charging port or directly into the battery’s Molex plug. Full charge at 1C (~0.42A) takes approximately 60 minutes. Do not leave unattended while charging.
Can I charge this with a LiPo balance charger instead of the USB cable?
No. This is a 2S toy-grade LiPo pack with a Molex plug, not a balance-lead LiPo battery. A standard 2S LiPo balance charger (with JST-XH or XT60 leads) will not fit the Molex connector on this pack. Use the included USB charger cable.
How long does the battery last per charge during actual driving?
A 420mAh 2S pack at 25C continuous (~10.5A) will last roughly 2–5 minutes of mixed driving depending on terrain, motor load, and throttle usage. On flat ground with moderate throttle, expect the longer end; on continuous rock crawling, sand, or full-throttle on inclines, expect the shorter end. If the pack drains in under 1.5 minutes consistently, contact us for a warranty check.
How many charge cycles can I expect?
Under normal use with proper practices (avoid deep discharge below 6.0V, store at 40–60% charge), expect up to 200 cycles before noticeable capacity fade. For daily toy use, this translates to roughly 4–8 months of regular play. If your pack is still holding charge past 150 cycles, it is performing within spec.
Is it safe to leave the battery in the car when not in use?
For short periods (same day), yes. For overnight or longer storage, remove the battery from the car and store it at 40–60% charge in a cool, dry place away from direct sunlight. Do not store fully charged or fully drained for extended periods — both accelerate capacity fade.
What comes in the box?
3× 2S 420mAh 7.4V 25C LiPo batteries (Molex plug), 1× USB charger cable, 1× retail carton, 1× user manual.