Silver-zinc.

This is coolbert:

Silver-zinc si, lithium no!

From the Internet web site Strategy Page yet one more Losharik item the submarine disaster.

"Submarines: Losing Losharik"

Losharik not lost but badly damaged. Cause as yet undetermined but thought be battery failure.

From the Strategy Page article:

"There are still questions about the batteries the Losharik used. The sub was originally designed to use Ukrainian made silver-zinc batteries but since 2014 Ukrainian military imports have been less 'available' and Losharik switched to Russian made lithium batteries, which behave differently than silver-zinc ones. Lithium batteries will catch fire and explode if they are short-circuited. How that happened on Losharik is still unknown, much less how to avoid it."

UKRAINIAN MADE BATTERIES NOT AVAILABLE BECAUSE OF BORDER DISPUTE AND CONFLICT WITH RUSSIA. KARMA CAN BE A BITCH!

Silver-zinc batteries as used the experimental American submarine Albacore (AGSS-569). Albacore a test-bed for new and promising technology. Silver-zinc batteries the advantages for submarine operations undeniable.

'when outfitted with her [Albacore] special high capacity silver-zinc battery, could out run a contemporary nuclear submarine. In 1966, she set the record as the world's fastest submarine having attained an underwater speed of nearly 40 miles per hour."

[it is believed the Soviet Alfa class and Papa class submarines during the era of the Cold War exceeded this speed, but only one vessel of those respective classes ever having sailed]

As to the advantage of using silver-zinc batteries from the wiki:

"Experimental new silver–zinc technology (different to silver-oxide) may provide up to 40% more run time than lithium-ion batteries and also features a water-based chemistry that is free from the thermal runaway and flammability problems that have plagued the lithium-ion alternatives."

As with some Samsung Galaxy Note 7 phones so too with the Losharik?

coolbert.