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No reference price listed — street prices move with the retailer and the season.
The Furukawa Battery Co., Ltd.

ECHNO HV

Aftermarket
Key specsAuxiliary battery for hybrids
Vehicle type Hybrid auxiliary
Variants
VariantsPart number JIS typeCase sizeTerminal side
S34B20LS34B20L S34B20LB20L
S34B20RS34B20R S34B20RB20R
S46B24LS46B24L S46B24LB24L
S46B24RS46B24R S46B24RB24R
S55D23LS55D23L S55D23LD23L
S55D23RS55D23R S55D23RD23R

A valve-regulated (VRLA) auxiliary battery only for Toyota-family hybrids, with a dedicated vent structure and a flame-arresting filter. Only common types we checked against the maker's line-up are listed here. See the official site for the rest. Check the type your car takes on the battery fitted now or in the owner's manual. Idling-stop and hybrid cars need their own types.

https://www.furukawadenchi.co.jp/products/car/hybrid_hv.htm
Check fitment and price yourself. The price is a reference figure from the time of our survey and does not track street prices. Always confirm fitment (model, year, chassis code, grade) and whether the part meets road regulations on the official The Furukawa Battery Co., Ltd. site. We do not broker sales.