Can confirm the Nokia replacement is the exact same dimensions and polarity as the original Clockwork one. Works out of the box (ok ok charge first).
Philips Avent SCD610, 1100mAh, has the exact dimensions too, working like a charm
Any new battery that would fit and improve the battery capacity in 2024 ? 
hi,
maybe interesting for somebody
I have this from temu and it fits well
I had to solder on cable connectors to match the socket on the PCB
https://www.temu.com/goods.html?_bg_fs=1&goods_id=601101168494289&parent_order_sn=PO-090-03681572280953033&_oak_order_sn=090-03681551309433033&_oak_goods_num=1&sku_id=17598558090929&_x_msgid=90-20260111-09-B-952376188900515841-427-0486fysT&_x_src=mail&refer_page_name=bgt_order_detail&refer_page_id=10045_1769218750154_ye7jasw7st&refer_page_sn=10045&_x_sessn_id=cnlhbzytv8
I honestly would not recommend buying battery from unreputable source, which include temu and sellers in AliExpress.
lithium battery are inherently dangerous and there is a lot of bad one on the market, and LiPo like this one are part of the most dangerous as they are really easy to pierce.
Battery from un reputable sources are even more prone to inflate and have risk of internal shortcut.
Buy these at your own risks.
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Kastar 4-Pack BL-5C Battery and Smart LCD Charger Replacement for Nokia BL-5C
