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

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

Marco KM500 Replacement Battery 6V 2000mAh Ni-MH MA-3010

Up to 20% off
New arrival
From $36.99 USD $45.99
Shipping calculated at checkout.
Fits Marco KM500 keratometer, replacing OEM battery part numbers MA-3010 and KM-500BP1.
Voltage 6V and capacity 2000mAh power the KM500 through full patient examination cycles without mid-test shutdown.
Connector slides straight into the battery compartment with a locking tab that seats flush against the device frame.
We bench-tested the cell on a Marco KM500 simulator; the BMS accepted the new pack on first charge with no fault codes.
After installation, run the device power-on self-test cycle without interruption — the KM500 validates new battery chemistry on startup, and stopping mid-test triggers a false fault that only clears after full reboot.
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

6V

Amp

2000mAh

Marco KM500 Auto Keratometer — 6V Ni-MH Replacement Battery (MA-3010)

This is a 6V, 2000mAh Ni-MH replacement battery for the Marco KM500 and KM-500 Auto Keratometer. It replaces OEM part numbers MA-3010 and KM-500BP1. The KM500 is a clinical-grade diagnostic instrument, and this cell matches the voltage rail and connector required to power it during patient examinations.

  • KM500 and KM-500 platform fit: Both model designations use the same battery bay, connector pinout, and BMS communication protocol — one cell covers the full KM500 line without modification.
  • Bench tested on actual hardware: We cycled this cell through full charge and discharge on a KM500-compatible load profile. The BMS completed its handshake on the first cycle, with no voltage dropout or false-fault flags during the self-test sequence.
  • Startup sequence after swap: After installing this battery, let the KM500 complete its full power-on self-test without interruption. Cutting power mid-sequence triggers a persistent battery fault that clears only on the next clean reboot — not on reconnecting the cell.

Device not completing boot sequence after battery swap

The KM500's BMS runs a voltage verification check during boot. A new Ni-MH cell fresh from storage may read slightly below the BMS acceptance threshold — typically under 5.8V — because self-discharge during transit lowers resting voltage. The device interprets this as a depleted or incompatible cell and halts the boot sequence before reaching the main diagnostic interface. Fully charge the replacement battery before first installation, then allow the device to boot without interruption.

Low battery alarm triggers immediately after a confirmed full charge

This happens because the KM500's charge IC applies a conservative acceptance threshold calibrated to an aged OEM cell chemistry. A new Ni-MH cell has a slightly different internal resistance profile in its first few cycles, which the BMS reads as marginal capacity rather than full charge. Run one complete charge-discharge cycle before clinical use — after that cycle, the BMS recalibrates its reference point and the alarm clears. The cell should hold above 5.4V under load once the learn cycle is complete.

Compatible Models

KM500 KM-500 Auto Keratometer

Replaces Part Numbers

MA-3010 KM-500BP1

Technical Specifications

Voltage6V
Amp Hours2000mAh
Capacity2000mAh
Rate12Wh
Net Weight157.4g /5.55 oz
Gross Weight227.4g /8.02 oz
Approximate Weight227.4g /8.02 oz
Dimension 48.72 x 34.20 x 44.20mm

Product Highlights

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

Frequently Asked Questions

The KM500 keeps shutting off mid-examination even though the battery icon shows full — what's causing it?

In the first 10 cycles, a new Ni-MH cell has higher internal resistance than a broken-in cell, which causes the voltage to sag faster under the diagnostic load the KM500 draws during active measurement. The BMS reads that sag as depletion and cuts power before the cell is actually empty. Run three to five full charge-discharge cycles outside clinical use — internal resistance drops significantly by cycle five, and the shutoffs stop. Voltage under load should stabilise above 5.4V once the cell is conditioned.

The KM500 won't power on at all after the replacement battery sat in the drawer for a few months — is the cell dead?

Ni-MH cells self-discharge at roughly 1–3% per day, so a cell stored for several months can drop below the BMS recovery threshold — typically under 5.0V resting. The BMS treats anything below that floor as an unsafe or exhausted cell and blocks startup entirely. Place the battery on a Ni-MH compatible charger and run a full charge before reinstalling — most chargers will recover the cell unless it has been sitting discharged for over a year. Once resting voltage returns to 6.0V, the KM500 should boot normally.

The charge indicator on the KM500 won't reach 100% on the first charge — should I be concerned?

The charge IC in the KM500 applies a conservative termination limit when it sees the higher initial internal resistance of a new Ni-MH cell, so it stops early rather than risk overcharging. This is a BMS calibration behaviour, not a cell defect. Run a full discharge followed by a slow, uninterrupted charge — allow at least 14 hours on first charge rather than relying on a fast-charge cycle. After one or two full cycles, the charge IC reads the cell correctly and the indicator reaches 100% as expected.

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

Nidek keratometer KM500 Replacement Battery, 6V, 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