Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Alcatel OT-BY20 Replacement Battery 3.7V 700mAh Li-ion

Up to 21% off
New arrival
From $22.99 USD $28.99
Shipping calculated at checkout.
Fits Alcatel OT-600A, OT-383A, OT-206, OT-355D and replaces OT-BY20, CAB30M0000C1, CAB30U0000C1, OT-BY10, CAB217000C21, CAB2170000C1, B-U8C, CAB2170000C2.
Voltage sits at 3.7V; capacity is 700mAh, matching the OT-600A's modem and display power draw without oversizing the pack.
Connector type is proprietary Alcatel two-pin contact; battery slides into the rear slot with a left-to-right orientation and snaps flush against the locking tab.
We bench tested on the OT-600A platform—the BMS accepted a standard trickle charge curve on first power, with the fuel gauge IC reading open-circuit voltage correctly from cycle one.
On first use after installation, run one full discharge-to-shutdown cycle without interruption; the fuel gauge IC needs to recalibrate against this cell's discharge curve before normal operation to avoid percentage jumps.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

3.7V

Amp

700mAh

Alcatel OT-600A / OT-383A Series — 3.7V Li-ion Replacement Battery (OT-BY20)

This is a 3.7V, 700mAh Li-ion cell replacing OEM part OT-BY20 and its variants (CAB30M0000C1, CAB2170000C1, B-U8C). It fits the Alcatel OT-600A, OT-383A, OT-206, OT-355D, and over 113 additional models sharing the same battery bay and connector. Dimensions are 46.60 × 33.90 × 4.70mm — verify against your existing cell before fitting.

  • Wide model compatibility across the OT series: These Alcatel models share a common battery bay geometry, connector pinout, and 3.7V nominal voltage rail. The same cell and BMS handshake protocol covers the full list, so one part number covers the range without firmware conflicts.
  • Bench tested on actual hardware: We cycled this cell through full discharge and recharge on OT-series hardware. The BMS responded correctly to charge termination and low-voltage cutoff — no false triggers and no thermal event during the charge-in phase.
  • Fuel gauge recalibration on first cycle: On first use after fitting, run one complete discharge to auto-off, then charge uninterrupted to full. This gives the phone's fuel gauge IC a clean reference curve against the new cell — skipping this step causes the percentage counter to report stale data from the old cell's discharge profile.

Why the OT-600A reports wrong battery percentage after a cell swap

Alcatel's OT-series phones use a coulomb-counting fuel gauge IC that builds its state-of-charge model from accumulated cycle data on the original cell. When you fit a new cell, the IC still references the old cell's internal resistance and discharge curve. The result is percentage readings that drift or freeze — often showing 80% then jumping straight to shutdown. One full uninterrupted discharge-charge cycle forces the IC to write a new baseline. After that cycle, the percentage counter tracks the new cell accurately.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — specifically during modem activity or screen-on states — even though the displayed percentage suggests capacity remains. At 700mAh, the OT-600A's cell is small, and a minor increase in internal resistance causes voltage to sag below the BMS cutoff threshold before the fuel gauge IC registers empty. If the phone was stored discharged for weeks before the swap, the first two cycles may show this behaviour until the cell stabilises. Check resting voltage after a full charge — it should read 4.15–4.20V; anything below 4.10V after a full charge cycle indicates a conditioning issue.

Compatible Models

OT-600A OT-383A OT-206 OT-355D OT-103 OT-103A OT-106 OT-203 OT-203A OT-203E OT-204 OT-216 OT-222 OT-222A OT-255 OT-255A OT-255D OT-305 OT-305A OT-355 OT-355A OT-380 OT-383 OT-565 OT-565A OT-706 OT-706A Crystal OT-S319 OT-S320 OT-S321 OT-508 OT-508PTT OT-S520 OT-V570 OT-600 OT-S621 OT-S626 OT-660 OT-660A One Touch 383A One Touch 206 One Touch 355D One Touch 103 One Touch 103A One Touch 106 One Touch 203 One Touch 203A One Touch 203E One Touch 204 One Touch 216 One Touch 222 One Touch 222A One Touch 255 One Touch 255A One Touch 255D One Touch 305 One Touch 305A One Touch 355 One Touch 355A One Touch 380 One Touch 383 One Touch 565 One Touch 565A One Touch 706 One Touch 706A One Touch S319 One Touch S320 One Touch 321 One Touch 508 One Touch 508PTT One Touch S520 One Touch V570 One Touch 600 One Touch 600A One Touch S621 One Touch S626 One Touch 660 One Touch 660A OT-105 OT-105A OT-108 OT-109 OT-208 OT-208A OT-209 OT-223 OT-223A OT-300 OT-505 OT-508 PTT VD-F150 VD-F250 One Touch 105 One Touch 105A One Touch 108 One Touch 109 One Touch 208 One Touch 208A One Touch 209 One Touch 223 One Touch 223A One Touch 300 One Touch 505 One Touch 508 PTT One Touch F150 One Touch F250 OT-508A OT-S520A OT-S521A One Touch 508A One Touch S520A One Touch S521A One Touch 217 One Touch 217D OT-217 OT-271D

Replaces Part Numbers

OT-BY20 CAB30M0000C1 CAB30U0000C1 OT-BY10 CAB217000C21 CAB2170000C1 B-U8C CAB2170000C2

Technical Specifications

Voltage3.7V
Amp Hours700mAh
Capacity700mAh
Rate2.59Wh
Net Weight16.3g /0.57 oz
Gross Weight41.3g /1.46 oz
Approximate Weight41.3g /1.46 oz
Dimension 46.60 x 33.90 x 4.70mm

Product Highlights

  • Brand: Alcatel
  • 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

My OT-600A won't turn on at all after sitting in a drawer with the new battery installed — what's happening?

A cell that ships or sits at low state-of-charge can drop below 2.5V in storage, triggering the BMS into lockout mode to prevent damage. The phone won't respond to a short press because the BMS is blocking output entirely. Connect the original charger and leave it for 20–30 minutes without pressing anything — the charge IC will slowly bring the cell above the BMS recovery threshold (typically 3.0V), after which the phone will respond normally. If the charge LED never illuminates, try a different USB cable before assuming a fault.

The battery percentage jumps around erratically — it shows 60%, then drops to 15% in minutes — is the cell faulty?

This is almost always the fuel gauge IC recalibrating against a new cell it has no reference data for, not a faulty cell. The coulomb counter inherited discharge curve data from your old battery and is applying it to a cell with different characteristics. Run one complete cycle — discharge the phone to auto-shutdown, then charge uninterrupted to 100% without unplugging early. After that single cycle the IC rewrites its baseline and the percentage display stabilises.

The phone gets noticeably warm near the battery during the first few charges — is that normal?

A new Li-ion cell typically has higher impedance on its first few charge cycles, which means the charge IC dissipates slightly more energy as heat while pushing current into it. On a 700mAh cell this is low absolute power, so the warmth is mild and localised — not a sign of a fault. It reduces after two or three full cycles as the cell's impedance settles. If the phone becomes hot to the touch or the warmth continues past the third cycle, check that the battery contacts are seated flat and making full contact.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Alcatel OT-600A Replacement Battery, 3.7V, 700mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections