# SLA battery charge parameters

**URL:** <https://community.victronenergy.com/t/sla-battery-charge-parameters/46669>\
**Category:** Q&A and troubleshooting\
**Tags:** lead-acid, marine, diy\
**Created:** [7 October 2025 18:18 UTC](https://community.victronenergy.com/t/sla-battery-charge-parameters/46669 "2025-10-07T18:18:57Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ianb](https://avatars.discourse-cdn.com/v4/letter/i/ee7513/32.png) [@Ianb](https://community.victronenergy.com/u/Ianb)\
**Post date:** [7 October 2025 18:18 UTC](https://community.victronenergy.com/t/sla-battery-charge-parameters/46669/1 "2025-10-07T18:18:58Z")

</div>

Hi all. I am in the middle of transforming my boat from a single start/house battery to a dual SLA LiFePo4 electrical system with solar panels. I know just about enough to get myself in trouble. I bought a SmartSolar 100/20 solar controller to charge my LiFePo4 battery but also want to charge my SLA start battery (M57MF CCA 530) if necessary in emergencies.

1. I find it odd that SLA batteries are not included in the presets. Is there a reason for this?
2. Assuming I can charge SLA batteries what are the charge parameters I would use for a preset in the battery type setting?

Thanks

Ian

---

<div class="post-metadata">

**Author:** ![MikeD](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/miked/32/1522_2.png) [@MikeD](https://community.victronenergy.com/u/MikeD)\
**Post date:** [7 October 2025 21:26 UTC](https://community.victronenergy.com/t/sla-battery-charge-parameters/46669/2 "2025-10-07T21:26:47Z")

</div>

SLA batteries are also known as Valve regulated lead acid (VRLA) or AGM (Absorbed glass mat), there are presets for these.

Absorption voltage 14.2 - 14.6V; Float 13.6 - 13.8V.

---

<div class="post-metadata">

**Author:** ![UpCycleElectric](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/upcycleelectric/32/36895_2.png) [@UpCycleElectric](https://community.victronenergy.com/u/UpCycleElectric)\
**Post date:** [7 October 2025 22:14 UTC](https://community.victronenergy.com/t/sla-battery-charge-parameters/46669/3 "2025-10-07T22:14:33Z")

</div>

I’d advise to double check with the manufacturer for the specific charge profile. SLA, VRLA, AGM but also Flooded, GEL, Calcium SMF to name a few are classifications with partially overlapping meanings that still allow enough difference in the actual details to require significantly different charge profiles.

---

<div class="post-metadata">

**Author:** ![system](https://europe1.discourse-cdn.com/victron/original/1X/21a9a7b5db7c6339715f993568736a7053199995.png) [@system](https://community.victronenergy.com/u/system)\
**Post date:** [21 October 2025 22:15 UTC](https://community.victronenergy.com/t/sla-battery-charge-parameters/46669/4 "2025-10-21T22:15:21Z")

</div>

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.