GBA 18v 6ah charging problem

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Roofer / Carpenter
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I have two GBA 18v 6ah, when charging on GAL 18v-160. It only charges to 80%

If I charge them on GAL 18v-40. They charge find too 100%

If I charge GBA 4ah and 5ah they charge find too 100% I have a third 6ah battery that charges find too 100%

Any ideas whey to 6ah is not charging to 100% on GAL 18v-160?

Thanks Jesper
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Roofer / Carpenter
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Just looking at buying that charger. Might hold on a bit
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not enabled
Sector
Roofer / Carpenter
Written on
Just looking at buying that charger. Might hold on a bit