How long does it hold a charge if I keep it in my bag as a spare?

(Perhaps overly detailed answer). I charged two of these batteries and a genuine SRAM one at the same time. I got 18 hours of riding out of the SRAM one over a 5 week period. Then I put in an MRX (5 weeks after charging), and got 12 hours over 4 weeks of riding. Then I put in the second MRX (now 9 weeks after charging) and got 8 hours. So, they seem to hold a charge well enough to use as backup.

Is this battery compatible with the sram etap charger?

I believe it’s the same charger for AXS and etap

What is the warranty on these batteries?

I don't know but for the money, just buy it. I haven't noticed the difference between it and the SRAM battery.

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2 Replacement Batteries for Sram AXS, for eTap Eagle XX1 X01 GX Reverb Force Rival Red XPLR, Just The Battery

Product ID: 393451992

Details

Battery Capacity
3 Volts
Battery Cell Composition
Lithium Ion
Brand
MRX Solutions
Number of Batteries
2 Product
Recommended Uses For Product
Bicycle

🔋Up to 60h runtime

🔴Red protective covers w/ charge switch

⚙️100% interchangeable SRAM AXS fit

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Description

🔋 Power your ride, own the trail—never settle for less.

VALUE PACKED BACKUP POWER - Two rechargeable lithium-ion batteries plus protective covers—because one is never enough.
SMART MONITORING WITH SRAM APP - Stay connected and informed with real-time battery level updates for peak performance.
ENDURANCE THAT KEEPS YOU RIDING - Up to ~60 hours of power for road derailleurs and droppers—never get caught off-guard mid-ride.
INSTANT BATTERY STATUS AT A GLANCE - Red covers with built-in charge indicator switch keep you prepped and in control.
SEAMLESS COMPATIBILITY ACROSS YOUR FLEET - Works flawlessly with SRAM AXS & eTap components including Eagle, Force, Rival, and RockShox Reverb.

MRX Solutions 2 Replacement Batteries & Red Covers deliver reliable, rechargeable lithium-ion power compatible with SRAM AXS and eTap components. Offering up to 60 hours runtime for road derailleurs and droppers, these fully interchangeable batteries come with red protective covers featuring charge status switches. Perfect for cyclists who demand seamless performance, smart app monitoring, and backup power on every ride.

Specifications

ASIN	B09BC3GY5W
Antenna Location	Bicycle
Battery Capacity	3 Volts
Battery Cell Type	Lithium Ion
Battery Weight	1 Ounces
Best Sellers Rank	#7,889 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Cycling Electronics
Brand	MRX Solutions
Customer Reviews	3.9 3.9 out of 5 stars (262)
Item Weight	0.06 Kilograms
Manufacturer	MRX Solutions
Model Name	Batteries
Number of Batteries	2 Product Specific batteries required.
Reusability	Rechargeable
Unit Count	1.0 Count
Voltage	12 Volts

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