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

MRX Solutions 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

⚡Fast 60-min USB charge

🔄100% interchangeable

🔋Up to 60h ride power

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Sold byAmazon PhilippinesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power your ride, own the trail — never get caught off-guard again!

SNAP CHARGE GO - Tool-free battery removal and quick USB charging means zero downtime between adventures.
DOUBLE UP FOR BACKUP - Two batteries plus red protective covers with charge status switches ensure you’re always race-ready.
LIGHTWEIGHT POWERHOUSE - At just 24g each, these batteries add minimal weight while maximizing your ride’s tech edge.
SEAMLESS COMPATIBILITY - Works flawlessly with SRAM AXS & eTap derailleurs, RockShox Reverb droppers, and SRAM app monitoring.
RIDE LONGER WORRY LESS - Up to 60 hours of battery life keeps your SRAM AXS components powered through epic rides and races.

MRX Solutions offers a pair of high-quality, rechargeable lithium-ion batteries designed specifically for SRAM AXS and eTap systems, including Eagle XX1, X01, GX, Force, Rival, Red, XPLR, and RockShox Reverb components. Each battery delivers up to 60 hours of ride time, charges fully in 60 minutes via USB, and is fully interchangeable between front and rear derailleurs. The package includes two batteries with red protective covers featuring charge status switches, ensuring you stay powered and prepared 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	#25,107 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4 in Cycling Electronics
Brand	MRX Solutions
Customer Reviews	3.9 3.9 out of 5 stars (269)
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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