# SmartLithium 330Ah deep-discharge recovery: is 0.5C essential

**URL:** <https://community.victronenergy.com/t/smartlithium-330ah-deep-discharge-recovery-is-0-5c-essential/63899>\
**Category:** DIY\
**Tags:** smart\_lithium, multiplus, marine, cerbo-gx\
**Created:** [13 October 2026 04:41 UTC](https://community.victronenergy.com/t/smartlithium-330ah-deep-discharge-recovery-is-0-5c-essential/63899 "2026-10-13T04:41:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![matthidinger](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/matthidinger/32/14522_2.png) [@matthidinger](https://community.victronenergy.com/u/matthidinger)\
**Post date:** [13 October 2026 04:41 UTC](https://community.victronenergy.com/t/smartlithium-330ah-deep-discharge-recovery-is-0-5c-essential/63899/1 "2026-10-13T04:41:09Z")

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Unfortunately through a series of failures I’m trying to recover severely discharged SmartLithium 330Ah batteries on my boat, one battery at a time.

Equipment:

- SmartLithium 330Ah, 12V system
- Victron `PMP122200102` MultiPlus 12/2000/80-50 120V VE.Bus, UL 458 (80A charger; current/non-Compact model)
- VE.Bus BMS V2
- Cerbo GX
- Balmar XT170 (170 Amp) alternator with MC-618 external regulator

The batteries were drained for a few days and read 2.5V at the terminals. I know, very bad.

I’m using the recovery procedure here:

> **[6. Troubleshooting & support](https://www.victronenergy.com/media/pg/Lithium_Battery_Smart/en/troubleshooting---support.html)**

1. **DONE** Initial 0.1A recovery until the lowest cell reaches 2.5V. This took about a day.
2. **CURRENTLY** : MultiPlus fixed charging at 13.8V and 0.1C (33A for one 330Ah battery).
3. **NEXT** : Once terminal voltage reaches 13.8V, increase to 14.2V and 0.5C (165A), followed by the six-hour charge/balance check and prescribed rest checks.

My `PMP122200102` MultiPlus can supply only 80A/0.24C. My only other charging source is the Balmar. I would prefer to keep this recovery as simple and controlled as possible rather than add a running engine unless it is genuinely necessary.

Questions:

1. Is 0.5C a necessary recovery condition, or a recommended current limit/target? Is 14.2V with an 80A current limit acceptable for this stage, allowing current to taper normally?
2. If additional current is necessary, is simultaneous charging with the MultiPlus and BMS-controlled Balmar acceptable for the later stage? My understanding of the MC-618 programming is I can try and get close at a constant RPM but not guaranteed.

Thanks all - appreciate any tips and good luck I can get here

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**Author:** ![M\_Lange](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/m_lange/32/16_2.png) [@M\_Lange](https://community.victronenergy.com/u/M_Lange)\
**Post date:** [13 October 2026 07:34 UTC](https://community.victronenergy.com/t/smartlithium-330ah-deep-discharge-recovery-is-0-5c-essential/63899/2 "2026-10-13T07:34:15Z")

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You don’t need to increase the current, you can continue with 0.1C until 100%.  
IMO it’s better to charge slowly.