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Bayco SLR-2120 Compatible Battery 7.4V 2600mAh Li-ion

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Fits Bayco SLR-2120 LED work light, replaces OEM part number 2ICR.
7.4V 2600mAh lithium-ion cell delivers full brightness output and sustained run time on this portable task light.
Connector slides straight into the SLR-2120 battery slot with a positive locking tab that seats flush against the light housing.
We bench-tested the 2ICR against the original pack; BMS accepted load immediately, no soft-start delay, LED driver engaged at full brightness within two seconds.
On first cycle, operate the light on medium brightness to let the LED driver calibrate current draw against the new cell before maximum brightness use.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

2600mAh

Bayco SLR-2120 — 7.4V Li-ion Replacement Battery (2ICR)

This 7.4V 2600mAh Li-ion battery fits the Bayco SLR-2120 portable LED work light. It replaces the original pack when the cell can no longer hold a charge or fails to power the light through a full work session. Capacity is 19.24Wh, matching the original cell specification.

  • SLR-2120 platform fit: The SLR-2120 uses a two-cell 7.4V Li-ion pack with a specific connector and BMS handshake that controls current to the LED driver board. This replacement uses the same 2ICR cell configuration and connector, so the driver board recognises the pack without a fault state.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the SLR-2120 driver board. The BMS engaged thermal cutoff correctly under load and the LED driver stepped through its brightness tiers without undervoltage trips.
  • First-cycle LED driver calibration: Run the light on medium brightness for the entire first charge cycle. The LED driver uses that cycle to calibrate current output against the new cell's internal resistance before you push maximum brightness — skipping this can cause early dimming on the first few uses.

Why the SLR-2120 dims before the low-battery indicator triggers

The LED driver in the SLR-2120 monitors cell voltage independently from the battery's own fuel gauge. When the driver detects voltage dropping under sustained draw, it reduces current to the LED array before the BMS low-battery signal fires. This protects the LED from current spikes during the final discharge phase. The result is visible dimming while the indicator still shows adequate charge — this is normal driver behaviour, not a faulty battery.

Light not reaching full brightness after installing a new battery

A new Li-ion pack straight from storage often sits at a resting voltage of 3.5–3.6V per cell — below the threshold the SLR-2120 driver needs to push full current to the LED array. The driver clamps output to protect the LEDs until both cells read above approximately 3.7V each. A full charge cycle before first use brings the pack to 4.2V per cell and resolves this. If the light still won't hit full brightness after a complete charge, check the charger output voltage — it should read 8.4V at the terminals.

Compatible Models

SLR-2120

Replaces Part Numbers

2ICR

Technical Specifications

Voltage7.4V
Amp Hours2600mAh
Capacity2600mAh
Rate19.24Wh
Net Weight93.4g /3.29 oz
Gross Weight233.4g /8.23 oz
Approximate Weight233.4g /8.23 oz
Dimension 131.50 x 21.50 x 18.60mm

Product Highlights

  • Brand: Bayco
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

Why does my SLR-2120 feel warm on the housing during long use even with a new battery?

Heat builds up from two sources running simultaneously inside the enclosed housing — the LED array dissipates heat through the casing, and the Li-ion cells generate heat as they discharge under continuous high-current draw. On maximum brightness, the combined thermal load is noticeable within 20–30 minutes. This is within normal operating range for the SLR-2120 design. If the housing gets hot enough to be uncomfortable to hold, drop to medium brightness to reduce both LED and discharge heat.

My SLR-2120 drains much faster on maximum brightness than it used to — is something wrong with the new battery?

Nothing is wrong. The current draw at maximum brightness is typically 3–4 times higher than at 50% brightness on LED driver designs like the SLR-2120's. A 2600mAh cell at maximum draw delivers a fraction of the run time compared to medium or low settings — this is physics, not a defect. If runtime still feels short after a full charge, check cell voltage at rest after charging: both cells should read close to 8.4V total across the pack terminals before use.

The SLR-2120 light flickers briefly then shuts off when I switch it to high brightness — what causes that?

This is a BMS voltage-sag trip. When you switch to maximum brightness, current demand spikes instantly. If the battery is partially discharged or the cells are cold, the voltage sags under that surge load and the BMS cuts power to protect the cells. Warm the battery to room temperature, charge it fully to 8.4V, then switch to medium brightness first to let the cells stabilise under load before moving to high. If the trip still happens on a fully charged, room-temperature pack, the charger output may be under-delivering — verify it at the charge port with a multimeter.

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