in answer to
@Deaky valid question, i thought i would check some stats:
That all seems a bit Heath Robinson to me
@Dellmassive. Can you not get this functionality built into the battery BMS?
LBD? - Low Battery Disconnect
LTD? - Low Temp Disconnect
The findings below are interesting . . . .
All of the batteries listed have the emergency low battery disconnect ranging from 8v-11.6v to protect themselves . . . . . but all recommend a low voltage disconnect from 11-12v. (that imply that the higher voltage disconnect will extend the life of the battery and the built in emergency disconnect is just a final safety device as below this point the cells are permanently damaged).
None of the batteries have low temp charging disconnects . . . but all have high temp safety cutoffs . . . .they all clearly state the charging parameters, and state the 0degC limit. That is except for the Relion & Epsilion that have internal heaters and are able to charge safety down to -10degC (albeit at a reduced rate). This seems to me a bit of a sales pitch . . . . they (manufacturers) know that charging below 0degC will damage the battery . . . . but the info is buried deep in the spec sheets. . . . . i wonder how many people will be killing there very expensive battery this winter due to this little bit of info? (remember these batteries will suck in 30/50/70/100 Amps when they charge . . . even from 90% full. Thats not good going into a frozen lithium pack/cell)
stats below and links to tech specs . . . . . . . . (check for yourself)
and if anyone has any other makes they want to mention, ill add them to the list.
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Victron Victron SuperPack, (
https://www.victronenergy.com/upload/documents/Datasheet-12,8V-Lithium-SuperPack-EN.pdf)
LTD - NO (Charge: +5°C to +45°C, Discharge: -10°C to +50°C )
LBD - NO - ?v (emergancy shutdown)(The internal switch will disconnect the battery in case of over discharge, over charge or high temperature.)
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TN (
https://www.batterymegastore.co.uk/amfile/file/download/file_id/451/product_id/8649/)
LTD - NO (Charge Temperature 0℃ to 45℃(32℉ to 113℉) @60±25% Relative Humidity)
LBD - NO - 10V (emergancy shutdown)
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Relion - (
https://www.alpha-batteries.co.uk/media/catalog/product/r/e/reliondata_6.pdf)
LTD - YES - (has heater) Discharge -20°C to +60°C, charge -20°C to +45°
LBD - NO - 8V (emergancy shutdown) (Recommended Low Voltage Disconnect 11 V)
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LifOS - (
Technical Information - LiFOS)
LTD - NO (Operating temperature in charge : 0°C à +60°C)
LBD - NO - Recommended Low Volt Disconnect 11.6V / reconnect @ 12.8V (
@ROMANY TAMPIN take note your battery lowest voltage is listed at 11.6V . . . dont let it drop below that)
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Valence U27-12XP (
Download Data Sheets - Lithium Werks)
LTD - NO (Operating temperature in charge : 0°C à +45°C)
LBD - NO - 10V (emergancy shutdown)
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PowerTech - Lithium-Ion Battery 12V – 100Ah – 1.28kWh – PowerBrick+ (
Lithium-Ion Battery 12V - 100Ah - 1.28kWh - PowerBrick+ / LiFePO4)
LTD - NO (Operating temperature in charge : 0°C à +60°C)
LBD - NO - 10V (emergancy shutdown)
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Ultramax - 100Ah 12V LiFePO4 LITHIUM BATTERY (
https://www.ultramax.co.uk/media/catalog/product/pdf//s/l/slaumxli100-12-tech_3.pdf)
LTD - NO (Charge Tempreture 0°C-45°C(32°F-113°F))
LBD - NO - 10V (emergancy shutdown)
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Epsilon SB12V1200Wh-M (https://www.super-b.com/content/fil.../Epsilon/Super_B_Epsilon_Manual_English_1.pdf)
Super B
LTD - YES - (has heater) Discharge -20°C to +60°C, charge -10°C to +45° (When temperature is < 0ºC or > 45ºC performance will be degraded.)
LBD - NO - 8V (emergancy shutdown)
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