751525 3.7V 200mAh LiPo Battery: The Fingertip-Sized 0.74Wh Cell for Wearables & IoT

When the entire device is the size of a coin, the battery has to disappear. The 751525 3.7V 200mAh LiPo battery is a miniature lithium polymer cell measuring just 7.5 × 15 × 25 mm and weighing only about 4g. With 0.74Wh of energy in a fingertip-sized package, it is the go-to cell for smartwatches, fitness trackers, TWS earbuds, GPS trackers, and the smallest IoT sensors.

This guide covers the HNF-751525 cell’s specification, its ultra-compact design, and the wearable and IoT applications where a tiny, light LiPo is the only option.

Why the 751525 Format: Maximum Capacity in a Fingertip

The model number encodes the geometry. The 751525 LiPo measures:

• 7.5 = 7.5mm thickness
• 15 = 15mm width
• 25 = 25mm length
• 200 = 200mAh capacity

The result is a 1S1P (single cell, single parallel) lithium polymer battery with a footprint of 7.5 × 15 × 25 mm and a weight of approximately 4g — small enough to sit inside a watch band or behind a tiny sensor board without adding noticeable bulk.

HNF-751525 3.7V 200mAh: Complete Specifications

The HNF-751525 is a 1S1P lithium polymer cell with a PCM (Protection Circuit Module) for safe, low-current use. Full ratings:

• Model: HNF-751525 200mAh 3.7V
• Nominal capacity: 200 mAh (standard discharge 0.2C after standard charge)
• Nominal voltage: 3.7 V
• Dimensions: 7.5 × 15 × 25 mm
• Weight: Approx. 4 g
• Configuration: 1S1P
• Energy: 0.74 Wh
• Cut-off charge voltage: 4.2 V
• Cut-off discharge voltage: 3.0 V
• Standard charge: 0.2C CC-CV, approx. 7.0 h
• Cycle life: ≥ 500 cycles at 80% capacity retention
• Operating temperature: Charge 0~+45°C / Discharge -20~+60°C
• Storage temperature: -10~+25°C (≤12 months)
• Certifications: CE / RoHS / IEC62133 / UN38.3 / MSDS
• Warranty: 12 months

Key Advantages of the 751525 LiPo Cell

• Fingertip-sized — 7.5×15×25mm and about 4g, the smallest cell in the LiPo family.
• Stable 3.7V output — predictable voltage curve for sensitive wearable electronics.
• Ultra-low self-discharge — holds charge through long shelf and shipping periods.
• Safe and long-lived — PCM protection plus ≥500 cycles at 80% retention.
• Air-shipment friendly — at 0.74Wh it is exempt from most battery shipping restrictions.
• Wide temperature range — discharges reliably from -20°C to +60°C.
• Customizable — HNF manufactures pouch cells to customer-specified dimensions and capacities.

Where the 751525 3.7V LiPo Is Used

The miniature footprint targets devices where every cubic millimeter and gram counts:

1. Smartwatches & Fitness Trackers

Wearables live inside a slim band or case. A 4g cell disappears into the chassis and powers heart-rate, GPS, and display for a full day.

2. TWS Earbuds & Hearing Aids

True-wireless earbuds and hearing aids need the smallest possible cell. The 751525’s 7.5mm thickness fits the stem or body without compromise.

3. GPS Trackers & IoT Sensors

Asset trackers, beacons, and environmental sensors run for months on a coin-sized cell. Low self-discharge keeps them alive between rare wake-ups.

4. Medical Wearables

Patch monitors and portable medical sensors need certified, light power. The cell’s CE/RoHS/IEC62133 compliance suits clinical wearables.

5. Bluetooth Remotes & Keyfobs

Compact remotes and fobs draw tiny standby current. A 200mAh LiPo lasts a year or more between charges in low-duty-cycle use.

Safety, Certification & Shipping

At just 0.74Wh the HNF-751525 is far below the 100Wh air-freight limit and exempt from most lithium-battery shipping restrictions — it ships by air with standard MSDS and UN38.3 documentation. Every cell is built to CE, RoHS, and IEC62133 standards and protected by an onboard PCM against over-charge, over-discharge, and short circuit. HNF applies multi-stage quality control across R&D, incoming inspection, production, pre-shipment, and after-sales.

Customization & OEM Options

The 751525 is a standard catalog cell, but HNF Battery is a custom lithium battery manufacturer. Share your required voltage, capacity, and dimensions and the engineering team will propose a pouch cell, protection circuit, and connector configuration to match — including ultra-thin or odd-shape pouches for space-critical wearables. In-stock items ship with no MOQ; custom cells typically start at 3,000–10,000 pcs depending on size and capacity. Samples are available and the sample cost is refunded once a bulk order is confirmed.

Frequently Asked Questions

Q: Can the 751525 be shipped by air?
A: Yes. At 0.74Wh it is exempt from most restrictions and ships with MSDS & UN38.3 documentation.

Q: How small is the cell?
A: 7.5 × 15 × 25mm and about 4g — small enough for a watch band or tiny sensor board.

Q: What is the minimum order quantity?
A: In-stock cells have no MOQ. Custom pouch cells typically start at 3,000–10,000 pcs.

Q: Can you customize the size?
A: Yes — HNF manufactures LiPo cells to customer-specified dimensions and capacities.

Q: Is the cell protected?
A: Yes, every HNF-751525 includes a PCM for over-charge, over-discharge, and short-circuit protection.