Compatibility of mixing different battery chemistries (Hytron and Dionic) on film production sleds

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2008Batteries/Power forum

18 years old. Gear and prices may have changed since.

DisputedParticipants disagreed and reached no conclusion. Read the findings as positions, not as an answer.

Mixing different battery chemistries in parallel connections is problematic because different chemistries have different discharge curves and internal resistance, which causes the higher-resistance battery to heat up excessively and degrade cells faster.
Batteries connected in series are safe to mix as long as the current load stays within the limits of the weaker battery, since current flow through series circuits operates independently of the connected batteries' chemistry.
Parallel connections of different chemistries risk damage because even fully charged batteries have intrinsic voltage differences that cause rapid energy transfer between cells.
Most standard sleds do not support mixed chemistry operation, though some models with isolated power supplies like the XCS can handle it.
Using a dedicated separate battery for 12-volt accessories on a third receptacle allows any chemistry since there is no sharing with the main 24-volt power system.
Schottky power rectifier diodes can be used in parallel battery configurations to prevent reverse current and cross-charging between batteries of different chemistries, though this adds some voltage drop and power loss.
Internal reverse-protection diodes built into some batteries may enable parallel operation even with mismatched voltages, but most batteries lack this feature.

Mixing chemistries successfully in parallel was demonstrated by at least one user, suggesting the general prohibition may not apply universally to all equipment combinations.
The practical voltage drop and runtime loss from using blocking diodes was not quantified.
Advice about the XCS sled's isolation capability was not detailed beyond stating it uses an input-level isolation power supply.
Some battery manufacturers' specifications about mixed-chemistry operation were referenced but not provided.