Is the Shure rechargeable battery worth it for GLXD+ systems?
Worth it, if you already own the system it plugs into
Why wireless mic batteries never last as long as the icon promises
You're mid set, glancing at the battery icon on a GLXD+ bodypack, doing math you shouldn't have to do while singing. Fresh AAs feel full in your hand and then, without warning, they aren't. That gap between feels fine and dead air is the exact problem a Shure rechargeable battery is built to close, not by adding more power, but by telling you the truth about how much you have left.
How the Shure SB904 rechargeable battery actually works
A GLXD+ system runs on dual band wireless, meaning the transmitter hops between two frequency bands to dodge Wi Fi and other interference in the room. That hopping isn't free, it costs power, and the amount it costs changes constantly depending on how crowded the airwaves are. Alkaline AAs can't tell you any of that, they just discharge quietly and let a four bar icon guess on their behalf. The SB904 is a lithium ion cell with a small chip built into it that actually measures its own state of charge and reports it to the transmitter in real time, so the receiver can show an estimate in hours and minutes rather than a shrug. That number gets recalculated as the radio's draw shifts, which is the whole point: you get an actual countdown instead of a bar chart that lies the same way near full as it does near empty. The rated runtime is up to twelve hours on a full charge, and the charging side is just as deliberate, drop it in the dock and it tops up on its own schedule without you doing anything but remembering to plug the dock in. Here's where your money actually goes: not into the lithium chemistry, which is the same stuff in half the gadgets on your desk, but into that gauge chip and the firmware handshake with the transmitter. The shape is also proprietary, it only seats in GLXD1+ bodypacks and GLXD2+ handhelds, so this isn't a battery you can borrow for anything else in the bag.
You're not buying a battery, you're buying a gauge. The chemistry inside is unremarkable, what you're paying for is the chip that tells the truth about it, and a receiver display that trusts that chip instead of guessing. Worth it if that certainty matters more to you than the extra seconds saved swapping in a fresh AA.
Who the Shure rechargeable battery is for, and who should skip it
Worth it if
- you already own a GLXD+ bodypack or handheld transmitter
- you are tired of guessing at AA battery bars mid set
- you want a charge dock routine instead of a battery drawer
- you run long sets and want a real runtime countdown
Skip it if
- you do not own a Shure GLXD+ system
- you are fine swapping AA batteries between sets
- you only use a mic occasionally and do not need the convenience
Not for anyone outside the GLXD+ ecosystem, the fit is proprietary and it won't rescue a different mic system.
Is the Shure rechargeable battery worth it
If you already own a GLXD+ system, this is a quiet yes, one spare cell removes the single anxiety wireless still carries. If you don't own that system, skip it entirely, the fit is proprietary and it won't work in anything else you own.
Day one with this in the bag is unglamorous on purpose: charge it overnight in the dock, snap it into the bodypack before load in, and stop thinking about batteries at all. That's the trade, a bit of upfront routine for the end of the mid set guessing game. No more counting bars, no more carrying a fistful of AAs as insurance, just a number on the receiver you can actually believe.
Amazon shoppers rate it 4.6 out of 5 across 151 ratings. That is their number, not ours.
Before you go
How long does a Shure battery last?
The SB904 is rated for up to twelve hours of runtime on a full charge, though how much you actually get depends on how hard the dual band radio is working to dodge interference.
What batteries do Shure mics use?
GLXD+ bodypacks and handheld transmitters use this specific SB904 lithium ion rechargeable cell, a proprietary shape that doesn't fit Shure's other wireless lines.
What is the downside of rechargeable batteries?
They lose a bit of maximum capacity with every charge cycle and cost more upfront than a pack of AAs, so they only pay off if you use the system often enough to need the convenience.
Is Shure a good brand?
Yes, Shure has a long track record for wireless and microphone hardware that holds up under daily gigging use in pro audio.
By the numbers
earn an unconditional yes at full priceOut of 34 musical instruments products we have reviewed. This one is a yes with a condition attached.
Verdict datasetQuestion indexCC BY 4.0
Full spec sheet
| Connectivity Technology | USB |
|---|---|
| Connector Type | USB |
| Special Feature | Rechargeable, Wireless |
| Compatible Devices | Headphone, Monitors |
| Polar Pattern | Unidirectional |
| Power Source | Battery Powered |
| Number of Batteries | 1 Lithium Ion batteries required. (included) |
| Number of Channels | 1 |
