# Charging the 4S 15.6Ah Lithium-Ion Battery with the H6 PRO

**URL:** <https://discuss.bluerobotics.com/t/charging-the-4s-15-6ah-lithium-ion-battery-with-the-h6-pro/11126>\
**Category:** Batteries and Chargers\
**Created:** [December 1, 2021, 8:48pm UTC](https://discuss.bluerobotics.com/t/charging-the-4s-15-6ah-lithium-ion-battery-with-the-h6-pro/11126 "2021-12-01T20:48:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jacobnihsal](https://avatars.discourse-cdn.com/v4/letter/j/a4c791/32.png) [@jacobnihsal](https://discuss.bluerobotics.com/u/jacobnihsal)\
**Post date:** [December 1, 2021, 8:48pm UTC](https://discuss.bluerobotics.com/t/charging-the-4s-15-6ah-lithium-ion-battery-with-the-h6-pro/11126/1 "2021-12-01T20:48:11Z")

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I’m looking at buying the 4S 15.6Ah lithium-ion battery for a project and I was wondering if the H6 PRO battery charger is compatible with this battery. I know it says this charger is made specifically for the 4S 18Ah lithium-ion battery but it can also support 4S lithium-ion batteries capacity of at least 10Ah. Is this charger compatible with the battery right from the get-go or do I need to adjust the firmware? Thanks for helping me out!

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**Author:** ![adam](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/adam/32/9438_2.png) [@adam](https://discuss.bluerobotics.com/u/adam)\
**Post date:** [December 2, 2021, 1:22am UTC](https://discuss.bluerobotics.com/t/charging-the-4s-15-6ah-lithium-ion-battery-with-the-h6-pro/11126/2 "2021-12-02T01:22:41Z")

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Hi @jacobnihsal,

The H6 pro battery charger will charge both the 15.6 Ah and 18 Ah batteries equally well out of the box on the limited firmware. With the limited out of box firmware, it will charge any 4S lithium polymer/ion battery with a max cell voltage of 4.20 V and capacity of at least 10 Ah (or that can take a 10 A charge current) just fine.

The product description for the charger was made before we launched the 15.6 Ah battery, we will update it to mention that one as well, thanks for pointing that out. 🙂

-Adam

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**Author:** ![jacobnihsal](https://avatars.discourse-cdn.com/v4/letter/j/a4c791/32.png) [@jacobnihsal](https://discuss.bluerobotics.com/u/jacobnihsal)\
**Post date:** [December 2, 2021, 2:30am UTC](https://discuss.bluerobotics.com/t/charging-the-4s-15-6ah-lithium-ion-battery-with-the-h6-pro/11126/3 "2021-12-02T02:30:32Z")

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Thank you!

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**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\
**Post date:** [December 2, 2021, 3:12am UTC](https://discuss.bluerobotics.com/t/charging-the-4s-15-6ah-lithium-ion-battery-with-the-h6-pro/11126/4 "2021-12-02T03:12:19Z")

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Welcome to the forum @jacobnihsal🙂

> [@adam](#):
>
> The product description for the charger was made before we launched the 15.6 Ah battery, we will update it to mention that one as well

Just confirming this has been updated now 🙂