how do you change battery

It's now a tool free operation, you take off the white rubber, then twist open the battery compartment, very simple.

My last hrm broke. water got in from a crack and it corroded. need to replace the seal on this one? so it doesnt let water in??

The HRM Pro plus is suitable for water training and shouldnt corrode if properly cared for post workout (fresh water treatment after chlorine pool or saltwater). If your HRM that broke was an HRM pro plus and had its casing cracked somehow the i would assume you may need to replace or repair it.

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Garmin HRM - Heart Rate Monitor Strap

Product ID: 452412728

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Details

Brand
Garmin
Material
Plastic
Colour
Black
Compatible devices
Smartphones
Team name
Garmin
Screen size
0.96 Inches

🔋Long-lasting Lithium-Ion battery

⏱️Real-time dual transmission

🏃‍♂️Advanced running dynamics

Description

❤️‍🔥 Elevate every heartbeat, own every stride!

TRUE UP MULTI DEVICE SYNC - Automatically updates steps, calories, and heart rate data across all your Garmin devices for consistent tracking.
COMPREHENSIVE RUNNING DYNAMICS - Monitor ground contact time, stride length, vertical oscillation, and more for elite performance insights.
DUAL ANT BLUETOOTH TRANSMISSION - Connects simultaneously to Garmin devices, fitness equipment, and popular training apps like Zwift.
PRECISION PACE DISTANCE TRACKING - Optimized for indoor and treadmill runs to keep your metrics sharp.
SEAMLESS HEART RATE STORAGE SYNC - Stores heart rate during swimming or team sports and syncs effortlessly post-activity.

The GarminHRM Heart Rate Monitor Strap delivers cutting-edge dual transmission via ANT+ and Bluetooth, advanced running dynamics metrics, and seamless multi-device syncing. Designed for multisport athletes and fitness enthusiasts, it stores heart rate data even during swimming and team sports, ensuring no workout detail is lost. Lightweight and durable with a rechargeable Lithium-Ion battery, it’s the ultimate companion for precise, real-time performance tracking across all your Garmin devices and compatible apps.

Specifications

Color	Black
Size	M
Style	HRM-Pro Plus
Team	Garmin
Compatible with	Smartphones
Display size	0.96 Inches
Display type	LED
Height	12 millimetres
Item display length	142 centimetres
Weight	0.5 Kilograms
Item display width	30 millimetres
Shape	Round
Material type	Plastic
Number of items	1
Seasons	Continuity
Features	Bluetooth
Sport	Multisports
Map type	North America
Included components	HRM Pro Plus, Documentation
Batteries included?	Yes
tech_spec_battery_description_toys	Lithium-Ion
Brand	Garmin
Department	Unisex
Manufacturer	Garmin
Language	English
Item model number	010-13118-00
Product Dimensions	3 x 1.19 x 59.99 cm; 51 g
ASIN	B0B3PNFK9H