We were contacted by somebody who bought the battery described below, who tells us it caught fire very dramatically.
This may have been to do with using the original Wiral charger - we're not electrical engineers so we can't shed any more light other than to pass on the information. But if you are thinking of purchasing the product below, or have already done so, be warned.
We love the Wiral Lite cablecam - great for getting drone-like shots in forests, for example.
Unfortunately the original battery that came with ours started to puff up. This is bad news for LiPO batteries and meant disposing safely of the original battery and replacing it.
It seemed unfeasibly difficult to find a replacement battery. None of Wiral's stockists seemed to list them, and when we contacted Wiral it took them several weeks to tell us they couldn't help. Thanks, Wiral!
Fortunately we found a LiPO battery with the correct dimensions and a similar capacity rating, available with the same XT30 connector. Like the original Wiral Lite battery it's a 11.1V 3S LiPO, but it's rated at 1300mAh capacity instead of the original's claimed 1500mAh. I doubt in practice the capacities are much different.
Here's what you want to order if you need a replacement Wiral Lite battery in the UK. This battery is small enough to fit fine in the Wiral Lite's battery bay. Larger capacity batteries are available but whether they'll fit is somewhat borderline.
1300mAh 11.1V 3S 25C Sport LiPO Battery from Overlander Batteries
(link now removed - see warning above)
Don't forget to specify the XT30 connector.
The Overlander battery comes with a balanced charging port. We found the original Wiral battery charger which charges unbalanced through the XT30 connector worked fine; but I'd be reluctant to leave it charging on the unbalanced charger unsupervised.