The BOSE SoundLink Mini II has earned its spot on desks, nightstands, and picnic tables for nearly a decade — big sound from a small brick. But after a few years of regular charging, the internal 086031 pack starts to tell on itself: shorter playback, blinking charge lights that never go solid, or worse, a swollen cell pressing against the grille. The 086031 3.7V 3000mAh replacement battery restores the original runtime so the speaker goes back to doing what it does best — playing music, not sitting on the charger.
The Problem: When the SoundLink Mini II Starts Losing Its Stamina
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Playtime collapse – a full charge used to deliver 8–10 hours; now it taps out after two.
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Flashing amber lights – the charger stays connected overnight but the indicator never settles to solid green.
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Swollen pack – the bottom grille or rubber foot starts to lift as the Li-ion pack expands.
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Sudden dropouts – mid-song the speaker cuts at 40% indicated, then needs a reboot.
These are not signs the speaker’s amplifier or drivers are failing. They are the battery reaching end-of-life after 300+ cycles. The audio hardware is still excellent — only the pack needs retiring.
The Solution: 086031 Replacement Pack
This Li-ion replacement pack is built to the same 3.7V spec BOSE uses in the SoundLink Mini II:
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3.7V / 3000mAh (~11.1Wh) matches the original energy budget — restores the rated 8–10 hour wireless playback the speaker was designed for.
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Same dual-cell pack layout with correct plug orientation and lead length as the outgoing 086031.
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Precision-fit drops into the Mini II chassis without forcing — same footprint and connector as the OEM pack.
Swap in a fresh 086031 and the SoundLink Mini II goes back to being the grab-and-go speaker it was on day one.
Technical Specifications
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Parameter
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Detail
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Brand
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BOSE-compatible (aftermarket)
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Model Number
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086031
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Battery Type
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Li-Ion (dual-cell pack)
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Voltage
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3.7V
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Capacity
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3000mAh / ~11.1Wh
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Condition
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Brand New
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Protection
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Overcharge, over-discharge, short-circuit protection built-in
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Compatibility
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Primary Fit: BOSE SoundLink Mini II (original release & Special Edition)
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Cross-Reference: 086031 (also fits where 061068 / 088268 appear on some batch labels — if unsure, send a photo)
Note: The SoundLink Mini I (first gen) and SoundLink Micro / Flex / Revolve use different batteries. Only the SoundLink Mini II uses the 086031 pack. Check the removed pack label before ordering — if it reads 086031, 061068, or 088268, this is your match.
Warranty & Guarantee
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12-Month Warranty – covers manufacturing defects and abnormal capacity loss under normal use.
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30-Day Money-Back Guarantee – not the right fit? Return within 30 days for a full refund.
We back every pack we ship. If it does not hold rated capacity, we replace it.
Keep the Sound, Change Only the Pack
The SoundLink Mini II still punches above its weight in 2025. The battery inside it does not. A fresh 086031 puts the portability back — no trade-in, no e-waste, no reason to retire a speaker that still sounds this good.
Order yours today and get back to cordless playback.
Frequently Asked Questions (FAQ)
Q1: Is this the same as the BOSE original 086031 battery?
This is a compatible replacement built to the same electrical spec — 3.7V, 3000mAh Li-Ion pack — as fitted to the SoundLink Mini II. It is not a BOSE OEM part, but performs to spec under normal operating conditions.
Q2: Can I install it myself?
Yes, but the SoundLink Mini II is held together with adhesive and small screws rather than a simple battery door. The process involves removing the rubber foot strip, undoing the screws underneath, and gently prying the aluminum housing apart. A plastic pry tool, Phillips #00 screwdriver, and patience are required. If you have not opened one before, a local electronics shop can do it in 20–30 minutes.
Q3: My old battery is swollen — is that safe to handle?
A swollen Li-ion pack means gas buildup inside the cells and should be handled carefully. Do not puncture it, do not bend it, and do not force it out. If the swelling is significant, consider having a repair shop remove it rather than DIY — they have the tools to extract a bulging pack without damaging the speaker grill or enclosure.
Q4: How do I confirm this is the right battery?
Check the label on the pack inside your speaker. If it reads 086031 (or 061068 / 088268 on some batch labels), this is the correct replacement. The SoundLink Mini I (first generation) uses a different pack and is not compatible — double-check before ordering.
Q5: Will the speaker recognize the new battery straight away?
Yes. Once installed and the speaker is charged, the SoundLink Mini II treats it like the original pack. The charge indicator behavior (amber charging → solid green) returns to normal as long as the pack is healthy and the connector is seated fully.
Q6: What if the battery arrives and does not hold charge?
Contact us within 30 days for a replacement or full refund. The 12-month warranty also covers premature capacity degradation under normal charge cycling.