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Jio JMR541 Compatible Battery 3.8V 2200mAh Li-ion

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Fits Jio JMR541 hotspot unit; replaces OEM battery part numbers EL-BP515761V and MFB260001.
3.8V, 2200mAh lithium-ion cell delivers 8.36Wh — sufficient for extended WiFi hotspot sessions with multiple connected devices.
Connector type is proprietary Jio contact; battery seats flat into the hotspot compartment with mechanical alignment tabs on both sides.
We bench-tested the cell on simulated mixed load — modem plus WiFi radio at maximum output power — and confirmed stable voltage delivery without sag during peak draw conditions.
Keep the hotspot in a well-ventilated location during extended sessions; the cellular radio operates at maximum output power when devices are far away, generating significant heat that stresses this battery.
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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.

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🔹 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

3.8V

Amp

2200mAh

Jio JMR541 — 3.8V Li-ion Replacement Battery (EL-BP515761V / MFB260001)

This 3.8V, 2200mAh Li-ion battery is a direct replacement for the Jio JMR541 portable mobile hotspot. It fits the JMR541 unit and restores power to the device when the original cell has degraded or failed. Capacity is rated at 8.36Wh.

  • JMR541 platform fit: The JMR541 uses a flat-profile Li-ion cell at 3.8V nominal — this replacement matches the original voltage rail, physical dimensions (64.85 × 57.15 × 5.50mm), and connector orientation so the BMS handshake initialises correctly on first boot.
  • Bench tested on actual hardware: We ran this cell under combined modem and Wi-Fi load — simultaneous 4G data transmission and multiple connected clients — and the BMS held without tripping or reporting a fault state through the full discharge cycle.
  • Ventilation during extended sessions: Keep the JMR541 in an open, ventilated spot during long sessions. When client devices are far from the hotspot, the cellular radio pushes maximum transmit power, generating heat that accumulates inside a pocket or bag and accelerates cell wear.

Mobile hotspot disconnecting users mid-session on a new battery

When the JMR541 is serving the maximum number of connected clients, the combined draw from the cellular modem and Wi-Fi radio spikes sharply. If the cell's internal resistance is higher than expected — even in a new battery that was stored long-term — the voltage can sag briefly below the BMS cutoff threshold, causing the unit to drop connections or restart. This is not a firmware fault. Charge the battery fully to 4.35V before the first session and allow one complete charge cycle before running the device at maximum client load.

JMR541 not powering on after sitting unused

Li-ion cells self-discharge at roughly 1–3% per month during storage. A JMR541 left unused for several months can arrive with a battery voltage below the minimum boot threshold — typically around 3.0V — and the device simply will not turn on. This is not a dead battery. Connect the unit to a charger and leave it for at least 30–45 minutes before attempting to power on; most BMS circuits include a recovery trickle mode that brings the cell back up from low-voltage sleep. If the charge LED does not activate at all, hold the power button while plugged in to force a BMS re-initialisation.

Compatible Models

JMR541

Replaces Part Numbers

EL-BP515761V MFB260001

Technical Specifications

Voltage3.8V
Amp Hours2200mAh
Capacity2200mAh
Rate8.36Wh
Net Weight44.5g /1.57 oz
Gross Weight69.5g /2.45 oz
Approximate Weight69.5g /2.45 oz
Dimension 64.85 x 57.15 x 5.50mm

Product Highlights

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

Frequently Asked Questions

The JMR541 keeps dropping all connected devices for a few seconds, then reconnects — what's causing this?

This is a voltage sag issue, not a Wi-Fi fault. When the cellular modem and Wi-Fi radio both hit peak draw simultaneously — typically when multiple clients transfer data at once — the combined current pull causes a brief voltage dip that trips the BMS protection circuit, cutting power momentarily. Reduce the number of active clients during heavy transfers, or move the hotspot closer to the cellular tower to lower modem transmit power. A full charge to 4.35V before each heavy-use session reduces the frequency of these trips.

The JMR541 battery drains far faster in some locations than others — why?

In areas with weak cellular signal, the JMR541's modem continuously increases transmit power trying to hold the connection — this is the single largest battery draw on the device, and it scales directly with how hard the radio has to work. Moving to a location with stronger signal, or positioning the hotspot near a window, reduces transmit power and extends charge significantly. You can also check the signal indicator on the JMR541's display — if it shows one or two bars, the modem is running near maximum output.

The JMR541 feels noticeably warm during long sessions — is this damaging the new battery?

Yes, sustained heat does accelerate Li-ion cell wear. The JMR541 generates heat from three sources running together: the cellular modem, the Wi-Fi radio, and the battery itself under load. If the unit is enclosed — in a bag, a pocket, or sitting on a soft surface — that heat has nowhere to go and the battery temperature climbs above the safe operating range. Set the device on a hard, flat surface with airflow around it during sessions longer than an hour. If the casing becomes too hot to hold comfortably, the battery temperature is likely above 45°C — power the unit off and let it cool before continuing.

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