CriticalResponse M1501 Pager Replacement Battery 3.7V 1050mAh
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CriticalResponse M1501 Pager Replacement Battery 3.7V 1050mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
CriticalResponse M1501 Pager Replacement Battery 3.7V 1050mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
1050mAh
CriticalResponse M1501 / REH-1501 — 3.7V Li-ion Replacement Battery (CS523450AL 1S1P)
This is a 3.7V, 1050mAh Li-ion cell for the CriticalResponse M1501 and REH-1501 pagers. It matches the OEM part number CS523450AL 1S1P and fits the same physical footprint at 53.40 × 38.00 × 7.50mm. These pagers are used in healthcare, emergency services, and industrial environments where alert delivery cannot be interrupted.
- M1501 and REH-1501 compatibility: Both models use the same single-cell Li-ion holder, voltage rail, and contact arrangement. One cell covers both — no wiring or adapter needed.
- Bench tested on actual hardware: We ran this cell through charge acceptance and BMS handshake verification. The protection circuit responded correctly to both low-voltage cutoff and over-charge thresholds at 3.7V nominal.
- Post-swap power cycle: After fitting the new cell, power the pager fully off and back on. Some M1501 units require a fresh boot to re-register on the paging network and reset the low-battery indicator to the new voltage baseline.
Why the M1501 drains faster during high-traffic alert periods
The M1501 draws more current when it receives frequent pages or when the signal from the local transmitter is weak and the receiver has to work harder. A 1050mAh cell at 3.7V has a fixed energy budget of 3.89Wh. Heavy alert traffic and extended signal-search cycles both pull from that budget faster than light-use standby. If your environment has changed — new building, relocated transmitter, increased message volume — expect shorter intervals between charges.
Low battery warning appears immediately after fitting a new cell
Cells ship at storage voltage, typically around 3.6–3.65V, which sits below the M1501's low-battery threshold. The pager sees this and flags the warning before the cell has been used at all. Charge the pager normally for a full cycle — once the cell reaches its working voltage range above 3.7V, the indicator clears. No fault with the cell or the device.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: CriticalResponse
- Manufacturer: CS
- Series: Standard
- Color: White Grey
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My M1501 stopped receiving pages after I swapped the battery — what's going on?
The pager needs a clean power cycle to re-register on the paging network after a battery change. Pull the cell, wait ten seconds, refit it, then power the unit fully off and on again. This resets the receiver and forces the pager to re-sync with the transmitter. If it still won't receive after one full power cycle, confirm the cell is seated flat against both contacts.
The terminal spring in the battery holder feels loose and the cell keeps losing contact — can I fix that?
The previous cell can compress the contact spring over time, leaving it too shallow to grip the new cell firmly. Use a non-conductive tool — a plastic spudger or a folded piece of card — to gently lift the spring back toward its original angle. Refit the cell and press it down until you feel resistance. A secure contact at both terminals should hold the reading stable.
My new cell reads low battery straight away but charges fine — is the cell faulty?
It isn't faulty. Cells ship at storage voltage, around 3.6V, which the M1501 interprets as low. Run one full charge cycle and the indicator will clear once the cell reaches operating voltage above 3.7V. We confirmed this behaviour on the bench — the cell accepts charge normally and the warning drops after the first charge completes.
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