Ultra-Thin Li-ion Polymer Cell
VTC022817 3.7V 45mAh Thin LiPo Battery
A 2.0mm-max rechargeable pouch cell for compact products where enclosure depth, weight and direct tab integration are critical design constraints.
1. Product overview
The VTC022817 is a rechargeable Li-ion polymer cell engineered for shallow, lightweight electronic assemblies. It delivers 3.7V nominal voltage and 45mAh rated capacity while keeping the pouch thickness to 2.0mm maximum. The compact 26mm maximum width, 17.5mm maximum height and approximately 1g weight help product teams reserve more enclosure volume for the PCB, antenna, sensors and mechanical structure.
This model is supplied as a bare cell with two flat metal tabs. It does not include a protection circuit, wires, connector or NTC. The device or derived battery pack must therefore incorporate a suitable charger, protection circuit, insulation system and secure cell mounting. The pouch body must not be bent, folded, pierced or compressed during assembly or service.
2. Core electrical parameters
| Parameter | Specification |
|---|---|
| Model | VTC022817 |
| Battery Type | Ultra-thin Li-ion polymer rechargeable cell |
| Nominal Voltage | 3.7V |
| Capacity | 45mAh rated; 48mAh nominal; 42mAh minimum |
| Charge Limit / Current | 4.2V; 22mA standard; 45mA rapid |
| Discharge Limit / Current | 2.75V cut-off; 22mA standard; 45mA maximum |
| Cell Dimensions | 2.0mm max thickness × 26mm max width × 17.5mm max height |
| Cell Weight | Approximately 1g |
| Operating Temperature | Charge: 10 to 45°C; discharge: -20 to 60°C |
| Cycle Life | ≥300 cycles under 0.2C datasheet test conditions |
The initial impedance is specified at no more than 420mΩ when measured at 3.7V and 1kHz. Standard charging time is approximately three hours, while rapid charging is approximately two hours. Charger and protection settings should be designed around the 4.2V upper charge limit and 2.75V discharge cut-off.
3. Cell size and tab structure
The shallow pouch geometry is the defining feature of this model. Enclosure drawings should use the maximum cell dimensions rather than the nominal model code. Tab pitch, length and width tolerances also need to be included in PCB, weld fixture and insulation design.
| Label | Description | Dimension |
|---|---|---|
| A | Cell tab length | 6 ± 2mm |
| B | Cell tab pitch | 5 ± 1mm |
| C | Cell tab width | 1 ± 0.2mm |
| D | Top sealant length | 3.5 ± 0.3mm |
| T | Thickness, maximum | 2.0mm |
| W | Width, maximum | 26mm |
| H | Height, maximum | 17.5mm |
4. Temperature, retention and cycle performance
Charging is specified from 10 to 45°C and discharging from -20 to 60°C, with operating humidity up to 90% RH. The cycle-life criterion is at least 300 cycles when tested with 0.2C CC-CV charging to 4.2V and 0.2C discharging to 2.75V, ending when discharge capacity falls to 80% of rated capacity.
For self-discharge evaluation, discharge capacity remains at least 85% of initial capacity after a 28-day rest at 20 ± 5°C followed by a 0.2C discharge. Actual service life and retained capacity depend on charge rate, discharge depth, temperature, storage voltage and the device load profile.
5. Protection and charging integration
The VTC022817 is not a finished protected pack. Device engineers must provide overcharge, over-discharge and short-circuit protection appropriate to the complete product, together with a Li-ion charging circuit limited to 4.2V. Any conductive component near the pouch edges and tabs must be insulated, and tab joining should use a controlled battery-production process rather than direct soldering on the cell body.
Mechanical design is equally important. The enclosure should retain the cell without sharp points, excessive pressure, bending or impact. Thermal paths, clearance around the seal, manufacturing tolerances and possible cell expansion during service should be reviewed before tooling.
6. Application fit
The combination of 45mAh rated capacity, 45mA maximum discharge current and 2.0mm maximum thickness fits low-power electronics that prioritize a thin industrial design. Plausible starting points include Bluetooth item-finder tags, active styluses, rechargeable authentication cards, wearable sensor patches, e-paper badges, BLE environmental loggers, slim voice recorders and compact location pendants. Final selection should be based on measured average current, radio pulse demand, sleep current, charging behavior and the required operating time.
7. VTCBATT OEM/ODM supply support
VTCBATT supports cell samples, factory-direct supply and engineering review for compact rechargeable products. For projects that need more than a bare cell, the team can evaluate tab connection, insulation, protection-circuit design, custom wires, connectors, labeling and complete pack assembly against the customer’s enclosure drawing and electrical requirements.
