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Spektrum Accessories
Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C
Spektrum Accessories

Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C

4.8(28 ratings)

Best price now

$12.99at Spektrum RCChecked 14 h ago

Compared across 5 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $12.99 at Spektrum RC (checked Nov 13, 2026).
  • Checked at 5 stores.

Our take on the Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C

This is a small 3-cell LiPo pack for micro and UMX-class 3S airplanes, rated 11.1V at 300mAh with a 30C continuous discharge. It uses a JST-RCY connector and weighs about 24.5g, so it fits light airframes where a bigger pack would throw off balance. The 30C rating gives roughly 9A continuous, enough for small brushless setups but not for high-draw 3D or EDF models. It is a straightforward replacement pack rather than an upgrade, and buyers rate it highly for fit and reliability in the planes it is built for.

Best forUMX and micro 3S airplane ownersPilots replacing a worn stock packLightweight park flyers with JST-RCY wiring
Pros
  • Correct fit and connector for UMX 3S planes
  • Light at about 24.5g
  • 30C continuous rating suits small brushless motors
  • Supports up to 3C charge rate
  • Compact 42mm length fits tight battery bays
Cons
  • Only 300mAh, so short flight times
  • JST-RCY plug limits it to low-current setups
  • Not for high-draw EDF or large 3D models
  • Single pack, no parallel or adapter options

Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C prices at every store

  • Spektrum RCNew

    In stock

    $12.99Checked 14 h ago
    Visit Spektrum RC
  • Ready Made RCNew

    In stock

    $12.99+ $3.30 shippingChecked 14 h ago
    Visit Ready Made RC
  • WalmartNew

    In stockSold by Horizon HobbyReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $12.99+ $4.99 shippingChecked 14 h ago
    Visit Walmart
  • Michaels RC HobbiesNew

    In stock

    $12.99+ $9.95 shippingChecked 14 h ago
    Visit Michaels RC Hobbies
  • HobbyTownNew

    In stock

    $12.99+ $20.80 shippingChecked 14 h ago
    Visit HobbyTown

Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C price history

Lowest price we've seen: $12.99 on Nov 13 at Michaels RC Hobbies. Tracked across 4 stores since Nov 13.

What reviewers say

  • 4.8 / 528 ratings

Buyers rate it highly and mostly use it as the stock replacement pack for UMX 3S planes. They report it fits and performs as expected, with the main gripe being short run time.

What people mention
  • FitPraisedOwners say it drops into UMX 3S planes with the correct JST-RCY plug and no adapter needed.
  • CapacityCriticisedReviewers note the 300mAh capacity gives short flights, so they carry multiple packs.
  • PowerPraisedThe 30C rating is seen as adequate for the small brushless motors these planes use.
  • WeightPraisedAt about 24.5g it keeps light airframes balanced.

About the Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C

This is a 3-cell LiPo battery pack with a JST-RCY connector. It is rated 11.1V and 300mAh, and it is made for UMX 3S airplanes.

The pack has a 30C continuous discharge rate and a maximum continuous discharge current of 9 amps. The maximum charge rate is 0.9 amps (3C). The discharge lead is 2 inches (51 mm) long.

Battery type
LiPo, 3.7V per cell
Cells
3
Voltage
11.1V
Capacity
300mAh
Connector
JST-RCY
Discharge lead
2" (51 mm)
Burst discharge
30C maximum
Continuous discharge
30C, 9 amps maximum
Charge rate
0.9 amps (3C) maximum
Application
UMX 3S airplanes
Length
1.65" (42 mm)
Width
0.74" (19 mm)
Height
0.7" (18 mm)
Weight
24.5 g

Questions and answers

Will this fit my UMX 3S plane?
It is built for UMX 3S airplanes and uses a JST-RCY connector. Check that your model's battery bay and plug match before buying.
How long can I fly on one pack?
At 300mAh, expect short flights typical of micro planes. Most owners bring several packs to a session.
Can I use it in a high-power EDF jet?
No. The 30C rating caps continuous draw at about 9A, which is too low for high-current EDF or large 3D setups.
What charge rate does it allow?
The pack is rated for charging up to 0.9A, or 3C. A standard 1C charge is gentler on the cells.
Is it a direct replacement for the stock pack?
Yes, it matches the voltage, capacity and connector of the stock UMX 3S pack, so no wiring changes are needed.
Where is the Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C cheapest?
At Spektrum RC, for $12.99, as of our latest check.
What do buyers say about the Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C?
Rated 4.8 out of 5 from 28 ratings.
Where can I buy the Spektrum SPMX3003SJ30 - 3S LiPo Battery w/ JST-RCY Plug, 11.1V 300mAh 30C?
5 stores we checked sell it, including Walmart, Spektrum RC, Michaels RC Hobbies, HobbyTown, Ready Made RC.

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