I just used 8 normal rechargeable AA batteries and charged via the socket on the side of the Tx.
I assume if your old packs were hardwired then the connectors aren't there any more in which case you'll have to swap like with like. Have you tried Vapex for suitable packs?
I too looked for suitable LiPo packs but without success, you'll have to stick with NiCad or NiMh.
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