Handy Reference Chart:
OEM batteries by series
71XX – Dark blue (C-S2) – 1000mAh
81XX – Gold/yellow (C-M2) – 1400mAh
83XX – Dark blue (C-S2) – 1000mAh
87XX – Dark Blue (C-S2) – 1000mAh
88XX – Green (lime) (C-X2) – 900mAh
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