X1 & S1 Wireless TENS Gel Pads — 24 Replacement Pads

X1 and S1 Wireless TENS Replacement Gel Pads — 24 Pads

These reusable replacement gel pads create the conductive and adhesive interface between a wireless TENS and heat device and the user’s skin.

Unlike conventional TENS electrodes, these proprietary pads do not use lead wires, 2 mm pins, pigtail sockets, or snap connectors. One side attaches directly to the gray conductive surface beneath the wearable device, while the other side adheres to clean, dry, intact skin.

Choose the model carefully:

• Select X1 Gel Pads for the iStim X1 Wireless Heat TENS Unit.

• Select S1 Gel Pads for the iStim S1 Wireless TENS Unit with Heat.

X1 and S1 pads are different sizes and should not be represented as interchangeable. The X1 uses larger 89 × 61 mm pads, while the S1 uses smaller 50 × 56 mm pads designed to fit its flexible wings. 

Compatibility notice: Confirm the model printed on the TENS device or original package before ordering. These pads fit only the specified iStim X1 or S1 wireless device and do not fit conventional wired TENS machines.

Product highlights

• Genuine replacement-pad format for iStim wireless TENS devices

• Choose X1 or S1 compatibility

• 24 individual gel pads

• Equivalent to 12 two-pad replacement sets

• Six resealable packages

• High-grade SEKISUI Japanese hydrogel

• Dual-sided adhesive and conductive design

• Device side attaches directly to the wearable unit

• The skin side creates the conductive skin interface

• No separate lead wires

• No 2 mm pin connector

• No snap or pigtail connection

• No additional electrode gel required

• Manufacturer-listed reuse of up to 30 applications with proper handling

• Protective films on both sides

• Manufacturer states latex-free

• Made in Taiwan

• Intended for single-user reuse

The pads use SEKISUI Japanese gel, have two protective films, should not be used with additional electrode gel, and may be reused up to 30 times under favorable conditions. Actual pad life depends on skin preparation, handling, perspiration, storage, and gel condition.

Choose the correct replacement pad

The X1 device has a broader treatment surface, a wireless remote, 15 TENS intensity levels, and two heat settings. The S1 uses flexible wings, 15 stimulation levels, a fixed 100 Hz program, and optional heat. Their different physical designs account for the varying dimensions of the replacement pads. 

What comes in each package?

The 24-pad package represents 12 complete pad changes when both gel pads are replaced together, as each of the X1 and S1 devices uses two gel pads at a time.

How the dual-sided gel pads work

Each pad has two adhesive conductive surfaces protected by separate films.

Remove the film labeled “Device Side,” position that side evenly over the gray conductive area, and avoid bubbles, wrinkles, or folds. 

Why complete contact matters

A pad that is folded, contaminated, or partly lifted may:

• Reduce the usable conductive surface

• Cause inconsistent stimulation

• Feel sharper in one area

• Allow the wearable device to shift

• Produce intermittent output

• Shorten pad life

• Increase the likelihood of skin irritation

Do not compensate for poor contact by simply raising the stimulation intensity.

How to install new X1 or S1 gel pads

1. Verify the device model

Verify the model name printed on the device, packaging, or manual.

• Order X1 pads only for an X1 device.

• Order S1 pads only for an S1 device.

Do not choose based solely on appearance because both products are wireless TENS-and-heat systems.

2. Turn the device off

The TENS and heat functions should be off before attaching, repositioning, or replacing a pad.

3. Remove the old pads

Peel each used pad slowly from the device’s conductive area.

Do not use sharp objects or scrape the gray conductive surface.

4. Inspect the device

Make sure the conductive underside is clean, dry, and undamaged. Follow the device manual when cleaning it; do not immerse the unit in water.

5. Identify the device side

Each new gel pad has protective film on both sides. Locate the film marked Device Side.

6. Attach the pad to the unit

Remove the device-side film and align the gel pad squarely over the corresponding gray conductive area.

Smooth the pad into place without

• Bubbles

• Folds

• Wrinkles

• Overlapping edges

• Uncovered conductive areas

• Gel extending beyond the intended pad location

7. Prepare the skin

Apply the device only to clean, dry, intact skin.

Remove:

• Lotion

• Body oil

• Perspiration

• Makeup

• Topical pain creams

• Loose debris

Allow the skin to dry before treatment.

8. Remove the skin-side film

Peel off the remaining protective film and apply the complete wearable device according to its instructions.

9. Begin at a low setting

Start at the lowest stimulation intensity and increase gradually to a strong but comfortable sensation.

10. Inspect after treatment

Turn the device off before removing it. Check the skin and both pads for redness, contamination, dryness, edge damage, or loss of adhesion.

Checking the pads for damage and proper adhesion before every session.

Pad care and storage

Proper handling can help preserve adhesion and conductivity.

1. Turn off the device.

2. Remove it slowly from the skin.

3. Avoid touching the gel surfaces unnecessarily.

4. Place the pads on the supplied parking board or protective storage surface.

5. Keep unused pads inside their resealable package.

6. Store them in a cool, dry location.

7. Keep them away from direct sunlight and excessive heat.

8. Keep each pad set assigned to one person.

9. Replace pads that are dirty, damaged, or no longer adhesive.

Recommend returning the pads to their parking boards after use, storing them in a cool, dry place and replacing them when they lose adhesion or become dirty. 

Do not:

• Add SignaGel, Spectra 360, or another electrode gel

• Add water, lotion or adhesive

• Wash or soak the pads

• Clean the gel with alcohol

• Scrape the hydrogel

• Cut the pads to fit another device

• Fold the gel surfaces together

• Leave the pads exposed between treatments

• Share used pads between people

• Use an X1 pad on an S1 or an S1 pad on an X1

How many times can the pads be reused?

The SEKISUI gel pads may be reused up to 30 times when properly handled. That number should be presented as a manufacturer-listed maximum, not a guaranteed lifespan. 

Actual life varies with the following:

• Skin oil

• Perspiration

• Body hair

• Lotion or topical products

• Frequency of treatment

• Treatment duration

• Handling of the gel

• Dust and lint

• Storage conditions

• Heat and humidity

• Repeated edge lifting

• Whether the parking board and resealable package are used

Replace a pad before 30 uses when its condition declines.

When should the pads be replaced?

X1 versus S1: which device do you own?

Frequently asked questions

Are X1 and S1 gel pads the same?

No. X1 pads measure approximately 89 × 61 mm, while S1 pads measure approximately 50 × 56 mm. The manufacturer sells them as separate products and states that each is compatible only with its corresponding device. 

How many pads are included?

Each replacement package contains 24 individual pads in six resealable packages.

Does 24 pads mean 24 pairs?

No. Twenty-four individual pads equal 12 two-pad sets.

How many pads does the device use at once?

Both the X1 and S1 use two gel pads simultaneously.

Are these complete electrodes?

They are proprietary dual-sided conductive gel interfaces that attach directly to the conductive underside of the compatible wireless unit. They do not contain a conventional lead-wire connector.

Will they fit a standard TENS unit?

No. They do not use standard 2 mm pins, pigtails, snaps, or tab connectors.

Can standard Balego TENS pads fit the X1 or S1?

No. Balego TENS electrodes are intended for conventional lead-wire systems.

Can X1 pads be used on the S1?

No. The dimensions and device surfaces differ.

Can S1 pads be used on the X1?

No. Smaller S1 pads would not properly cover the X1 conductive areas.

Which side attaches to the device?

Remove the protective film labeled Device Side and attach that gel surface to the gray conductive area beneath the device. 

Are both sides sticky?

Yes. One side adheres to the device and the other adheres to the skin.

Should additional electrode gel be applied?

No. The manufacturer specifically says not to add extra electrode gel. 

Can the pads be washed?

They should not be washed or soaked unless future manufacturer instructions expressly say otherwise. Use the protective films, parking board, and resealable storage package to keep them clean.

How long do the pads last?

The manufacturer states up to 30 uses when properly handled, but actual life varies. Replace them when adhesion, cleanliness, comfort, or conductive performance declines.

Are the pads reusable?

Yes, the pads can be reused by one person as long as the gel remains clean, intact, and adequately adhesive.

Can the pads be shared?

No. Reusable electrotherapy pads should remain assigned to one user.

Can the pads be cut?

No. Cutting them may prevent full contact with the device’s conductive areas and alter current distribution.

Are the pads latex-free?

They have passed latex-free testing. Customers with known adhesive sensitivities should still inspect the skin and discontinue use if irritation develops. 

Are they suitable for sensitive skin?

The SEKISUI gel is biocompatible, but no adhesive product can be guaranteed free of irritation for every user. Stop treatment if significant redness, itching, blistering, or burning develops.

Does this listing include the wireless TENS device?

No. It contains replacement gel pads only.

Additional Recommended Resources

• TENS Guides, Modes and Electrode Education

• Contact Balego