If your mainboard power pins are straight, and the force required to insert the connector is too high to gently insert the battery connector, I found applying a TINY amount of dielectric grease to the tip of a sim card remover, then rubbing the grease directly onto the mainboard pins allowed it to insert. I only needed a tiny amount of grease, it was almost not visible to the naked eye, however this allowed the battery connector to insert into the mainboard connector without using a force that felt it was about to break the mainboard connector.
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If your mainboard power pins are straight, and the force required to insert the connector is too high to gently insert the battery connector, I found applying a TINY amount of dielectric grease to the tip of a sim card remover, then rubbing the grease directly onto the mainboard pins allowed it to insert. I only needed a tiny amount of grease, it was almost not visible to the naked eye, however this allowed the battery connector to insert into the mainboard connector without using a force that felt it was about to break the mainboard connector.