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

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

H-Wave OSA476 Replacement Battery 7.2V 2000mAh Ni-MH H4

Up to 19% off
New arrival
From $53.99 USD $66.99
Shipping calculated at checkout.
Fits H-Wave H4 and OTC models; replaces OEM part number OSA476.
7.2V 2000mAh Ni-MH chemistry delivers steady power output for full treatment sessions on the H4 handheld unit.
Battery slides into the rear compartment with a single locking tab; connector aligns vertically and seats flush against the contact plate.
We bench-tested this cell in the H4 charge circuit; the BMS accepted a full 2000mAh charge cycle without cutoff or thermal drift.
After installation, let the device complete its power-on self-test without interruption — the H4 runs a BMS verification at startup, and interrupting this sequence triggers a false low-battery alarm that persists until the next full reboot.
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

7.2V

Amp

2000mAh

H-Wave H4 / OTC — 7.2V Ni-MH Replacement Battery (OSA476)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the H-Wave H4 and OTC portable electrotherapy units. It replaces OEM part OSA476 and restores full power delivery to the device's electrical nerve stimulation circuits. Capacity matches the original specification — 14.4Wh total energy.

  • H4 and OTC platform fit: Both units share the same battery bay geometry, connector pinout, and BMS handshake protocol. The OSA476 cell format is identical across both models, so one part number covers either device without modification.
  • Bench tested on actual hardware: We cycled this cell through the H4's full charge-discharge sequence and confirmed the BMS accepted state-of-charge readings correctly from cycle one. Charge termination triggered cleanly at full capacity with no false cutoff events.
  • Power-on self-test handling: After installing the battery, let the H4 complete its startup self-test cycle without interruption. The device runs a BMS verification pass at boot — cutting power mid-sequence causes the unit to log a battery fault that persists until the next clean reboot.

Why the H4 trips a low-battery alarm on a freshly charged OSA476

The H4's BMS uses a voltage threshold calibrated to an aged OEM cell's charge curve. A new Ni-MH cell delivers a slightly different voltage profile during the first few cycles, which can sit outside the BMS's expected window. The device reads this as a low-charge condition even when the battery is fully charged. Running one complete charge-discharge cycle lets the BMS learn the new cell's actual resting voltage and clears the alarm permanently.

H4 won't power on after battery sat unused in storage

Ni-MH cells self-discharge during storage — if the OSA476 sat for several months before installation, its resting voltage may have dropped below the H4's BMS recovery threshold. At that point the device won't boot because the BMS treats the voltage as an unsafe deep-discharge state. Place the battery in the H4 and connect the charger for a full charge cycle before attempting to power on. If the charger accepts the cell and completes normally, resting voltage will return to the 7.2V operating range and the unit will boot.

Compatible Models

H4 OTC

Replaces Part Numbers

OSA476

Technical Specifications

Voltage7.2V
Amp Hours2000mAh
Capacity2000mAh
Rate14.4Wh
Net Weight159g /5.61 oz
Gross Weight209g /7.37 oz
Approximate Weight209g /7.37 oz
Dimension 84.80 x 50.30 x 14.30mm

Product Highlights

  • Brand: H-Wave
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My H4 shows a low battery warning the moment I turn it on, even though I just charged the new battery — what's happening?

The H4's BMS compares resting cell voltage against a threshold set for a worn-in OEM cell. A fresh Ni-MH cell has a slightly different charge curve, so the BMS misreads it as low on the first boot. Run one full charge-discharge cycle on the device before clinical use — after that single cycle the BMS learns the new cell's voltage profile and the alarm clears.

The H4 shuts off unexpectedly mid-session after I installed the replacement battery — is something wrong with the cell?

New Ni-MH cells perform differently under load in the first 10 cycles — the internal resistance is slightly higher before the cell is broken in, and the H4's stimulation output draws enough current to trip the BMS undervoltage cutoff under load. This is not a defective cell. Complete three to five full charge-discharge cycles under normal use and the cutoff threshold issue resolves as internal resistance drops to its rated level.

The charge indicator on my H4 never reaches 100% on the first charge of the new battery — should I stop and restart?

This is normal behaviour. The H4's charge IC applies a conservative current limit on an unrecognised new cell, which extends charge time and may stall the indicator below 100%. Let the charge cycle run to natural termination without interrupting it — the IC will complete the cycle and the indicator will reach full on the second charge once the cell's capacity is logged.

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

H-Wave H4 Replacement Battery, 7.2V, 2000mAh, Ni-MH 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