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WLToys 1S 3.7V 400mAh LiPo Battery (K127)
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  • WLToys 1S 3.7V 400mAh LiPo Battery (K127)
  • WLToys 1S 3.7V 400mAh LiPo Battery (K127)
WLToys 1S 3.7V 400mAh LiPo Battery (K127)
  • WLToys 1S 3.7V 400mAh LiPo Battery (K127)
  • WLToys 1S 3.7V 400mAh LiPo Battery (K127)

WLToys 1S 3.7V 400mAh LiPo Battery (K127)

R205.00
Tax included

The WLToys 1S 3.7V 400mAh LiPo battery is the correct replacement battery for the K127 RC helicopter, designed to match the stock voltage and capacity for consistent flight performance.

Quantity
Out of Stock

1 review
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The WLToys 1S 3.7V 400mAh LiPo battery is a replacement or spare battery for the K127 RC helicopter. It uses a single cell 3.7V configuration which matches the K127 power system requirements.

A spare battery is useful for extending flying time between charges, and for keeping a fresh pack ready while another battery is charging. Using the correct voltage helps maintain predictable throttle response and protects the electronics.

Typical uses

  • Replacement battery for a worn or damaged K127 pack
  • Spare battery to extend flying time per session
  • Keeping multiple packs charged for training and practice flights

Key features and specifications

  • Brand: WLToys
  • Battery type: LiPo
  • Cell count: 1S
  • Voltage: 3.7V
  • Capacity: 400mAh
  • Compatibility: K127 RC helicopter

Important notes

  • Confirm the connector matches your K127 battery before ordering, as connector types can vary by batch
  • Use only 1S 3.7V batteries with the correct connector for the K127
k127-batt
1 review
Christian K.
WLToys 1S 3.7V 400mAh LiPo Battery (K127) - Good

The battery did not fit easily and is very tight once inserted. The performance is like new. The fit will probably improve over time with use.

Reply · James R.
Hey Christian, Thank you for the review. Yes the battery is a tight fit to start with and I am sure they do this on purpose so that you don't lose a battery during flight as you use it. Its good to hear that your flight performance has been restored! Fantastic!
View all reviews

LiPO Battery FAQ

You choose a LiPo pack based on three main numbers, voltage, capacity and C rating. Voltage comes from the cell count, for example 2S is 7.4v, 3S is 11.1v. Capacity in mAh affects flight time, higher capacity usually gives longer runtimes but also more weight. C rating indicates how much current the pack can safely supply. Your model and ESC manual will normally list a recommended cell count and an approximate capacity range to use as a guide.
The S number tells you how many cells are connected in series inside the pack. A 2S pack has two cells and a nominal voltage of 7.4v, a 3S pack has three cells and 11.1v, and a 4S pack has four cells and 14.8v. Higher S counts give more voltage to the motor, which usually means more power but also higher load on the ESC and motor. You must only use the cell count that your model and electronics are designed for.
The C rating is a guide to how much current the pack can safely deliver. You can estimate the continuous current limit by multiplying the pack capacity in amp hours by the C rating. For example a 2200mAh pack is 2.2Ah, at 30C that is roughly 2.2 times 30 which equals 66 amps. These numbers are guidelines, not guarantees, so it is sensible to choose a pack with some safety margin above the maximum current your model is expected to draw.
LiPo batteries must always be charged with a LiPo compatible balance charger using the correct cell count and charge current. A common rule is to charge at 1C, which means a 2200mAh pack is charged at 2.2 amps. The balance plug must be connected so the charger can monitor each cell. Packs should be charged on a non flammable surface and should not be left unattended while charging.
LiPo batteries last longest when they are stored partially charged rather than full or completely flat. Most chargers have a storage mode that charges or discharges the pack to about 3.75 to 3.85 volts per cell. Packs should be stored in a cool, dry place, away from direct sunlight and sharp objects, and should be checked periodically so that they do not sit for long periods at very low voltage.
Most models will start to feel noticeably down on power when the LiPo is getting low. It is best to land or stop as soon as you feel that drop rather than squeezing out extra minutes. Many ESCs have a low voltage cut off that will reduce power or shut the motor down to protect the pack. As a rule of thumb, aim to use only about 70 to 80 percent of the pack’s capacity and keep the voltage under load from dropping much below about 3.5 volts per cell during use.
If a product is marked In Stock on our website, it means we physically have the item in stock with us in South Africa and it is ready to ship. If a product is marked Out of Stock, then it is not currently available. You can also check the Product Details tab on the page to see the current stock quantity. We are not a drop shipper, the stock status shown on our site reflects what we actually have on hand.
Yes, we are more than happy to guide you through the world of LiPo batteries. Please first read our article on LiPo batteries here: https://theflitelab.co.za/content/16-the-big-lipo-guide

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