The standards "used" to be fresh AA batteries right before showtime... but those holding onto that standard are doing so out of stubborness mostly. With a bit of brand/cell experimentation you can find rechargeable that will work well (perhaps just not as long) in most AA wireless setups. The trick is knowing what you are putting in it. It works best for permanent house gear where you can keep track of rechargeable cells and replace them on a schedule (or retire them to less critical uses). A big tradeshow with a whack ton of rental gear is still likely to use alkaline if possible.
However there is a new trend where brands are offering their own packs and bank chargers... and really pushing people to adopting those. Some of those are seemingly intentionally less compatible with off the shelf rechargeables, or have piss poor lifetime with them... perhaps they are expecting Lithium levels of voltage for longer etc, but they still work reasonably well with alkaline chemistry... so we are kinda back to square 1 unless you spring for the kit of batteries and convenient rack mount charger, or perhaps something like these would be an interesting attempt, despite the lower rated capacity.
However there is a new trend where brands are offering their own packs and bank chargers... and really pushing people to adopting those. Some of those are seemingly intentionally less compatible with off the shelf rechargeables, or have piss poor lifetime with them... perhaps they are expecting Lithium levels of voltage for longer etc, but they still work reasonably well with alkaline chemistry... so we are kinda back to square 1 unless you spring for the kit of batteries and convenient rack mount charger, or perhaps something like these would be an interesting attempt, despite the lower rated capacity.
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