T-Mobile MyTouch 3G Replacement Battery 35H00119-00M 3.7V
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
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T-Mobile MyTouch 3G Replacement Battery 35H00119-00M 3.7V - 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.
T-Mobile MyTouch 3G Replacement Battery 35H00119-00M 3.7V - is backordered and will ship as soon as it is back in stock.
Voltage
3.7V
Amp
2680mAh
T-Mobile MyTouch 3G / G1 Touch — 3.7V Li-ion 2680mAh Replacement Battery (35H00119-00M)
This is a 3.7V Li-ion battery rated at 2680mAh (9.92Wh), replacing OEM part 35H00119-00M. It fits the T-Mobile MyTouch 3G and G1 Touch smartphones. Swap it when the original cell no longer holds a useful charge through a normal day of calls, messaging, and app use.
- MyTouch 3G and G1 Touch compatibility: Both devices share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail. The BMS handshake on each accepts the same cell chemistry, so one part number covers both platforms without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on a MyTouch 3G unit. The BMS accepted the cell without fault flags, charge current ramped correctly through CC/CV phases, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
- Fuel gauge recalibration on first install: After fitting this battery, run one complete discharge-charge cycle with fast charging disabled. The MyTouch 3G fuel gauge IC was calibrated against the original cell's discharge curve. A full slow cycle lets it map the new cell before the OS reports percentage data you can trust.
Why the MyTouch 3G reports wrong battery percentage after a cell swap
The fuel gauge IC in the MyTouch 3G tracks charge state using a coulomb counter trained on the original cell's internal resistance and discharge curve. A new cell has different impedance characteristics, so the counter starts working from a mismatched baseline. Until it completes at least one full discharge-to-cutoff followed by a full charge cycle, the reported percentage can be off by 10–20%. This is not a fault with the replacement cell — it resolves after one complete calibration cycle at low current.
Sudden shutdown at 20–30% on the new cell
This happens when the modem or display draws a high current spike and the cell voltage sags below the BMS cutoff threshold — even though the fuel gauge still reads 20–30%. It is a voltage cliff caused by the fuel gauge IC using stale impedance data from the old cell. The new cell has lower internal resistance, but the IC hasn't mapped that yet. Run one full slow discharge until the phone powers off naturally, then charge to 100% — the cliff disappears once the coulomb counter recalibrates to the new discharge curve.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: T-Mobile
- Manufacturer: CS
- Series: Extension
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The MyTouch 3G powers off completely after coming out of storage — I can't get it to turn on at all. What's happening?
If the phone sat in storage with a depleted battery, the cell voltage likely dropped below 2.5V and the BMS entered lockout mode to prevent damage. Plug it into a wall charger — not a USB port — and leave it for 20–30 minutes without pressing any buttons. The charge IC needs to trickle current into the cell before the BMS will release the lockout and allow the phone to boot. If the screen shows nothing after 30 minutes, disconnect and reconnect the charger to trigger a fresh trickle-charge attempt.
The battery percentage on my MyTouch 3G jumps around erratically — it reads 60%, then suddenly 35%, then back up. Is the battery faulty?
The fuel gauge IC is recalibrating against the new cell's discharge curve and the coulomb counter is working from stale data. This is normal after a cell replacement — the IC hasn't yet mapped the new cell's impedance profile. Complete one full discharge cycle by using the phone normally until it shuts itself off, then charge uninterrupted to 100% with the screen off. The erratic jumping stops once the IC locks onto the correct curve, typically after that single full cycle.
The phone feels noticeably warm near the battery compartment during the first few charges. Is that normal with a new cell?
A new high-impedance cell dissipates slightly more heat during the initial charge cycles than a broken-in cell does. The charge IC pushes constant current into a cell that hasn't yet settled to its steady-state internal resistance, which produces more heat at the junction. It is not a fault, and warmth — not heat you can't hold your hand against — is within normal range. If the phone becomes too hot to hold or the charge stops and won't resume, stop charging and check that the battery is seated flat with no gap at the connector.
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