Which is better for a 1/10 RC car?

Either works if the plug matches. Most 1/10 cars use XT60, so the Ovonic drops in; EC5 cars take the HRB. Both are 3S 5000mAh, so runtime is about the same.

Is the HRB 100C really twice the Ovonic 50C?

No. C ratings are marketing numbers, and a 5000mAh pack cannot safely deliver 500A. Treat both as normal 3S packs and match the plug and price.

Neither is documented for cycle life. Both are standard LiPo packs; storage at about 3.8V per cell and charging at 1C or less matters more than the brand.

Can I swap the plugs?

Yes, if you can solder. EC5 and XT60 are both common, and adapters exist. Soldering new plugs voids nothing but takes care with 10 AWG wire.

Is one worth extra money?

Only if the plug saves you an adapter or the higher C rating matters for a high-draw setup. Otherwise buy the cheaper pack with the right connector.

Do both fit the same models?

Only with an adapter. HRB uses EC5 and Ovonic uses XT60, so check your ESC plug before ordering.

HRB 3S 5000mAh Lipo Battery EC5 100C 11.1V RC Lipo Battery (2packs) vs Ovonic 3S 11.1V 5000mAh 50C LiPo Battery Pack with XT60 Plug (2 Pack)

Both packs are 3S 5000mAh LiPo two-packs, so the real split is the connector and the discharge rating. The HRB lists a 100C rating and EC5 plugs; the Ovonic lists 50C and XT60 plugs. Pick by the plug your car or plane already uses, not by the C number. No current price was provided for either pack, so compare live store prices on this page before buying.

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