These use the same A123 cells and are packaged with a charger. Could be suitable for a feather.
If you only need 10 Volts it would be convenient way of getting everything you need. £145 + DUTY for 6 cells and a balancing charger (Two 3S1P Starter Kit). Best to avoid the Turbo Voltage Controllers - presumably mainly just a device to switch off the power if they get close to fully discharged.
For comparison, the DeWalt 36V packs (10 A123 cells) go for around £70 on ebay.
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