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

ECHNO IS UltraBattery

Aftermarket
Key specsFor idling-stop cars
Vehicle type Idling stop
Variants
VariantsPart number Idling-stop typeCase sizeTerminal side
K-42/B19LK-42/B19L K-42B19L
K-42R/B19RK-42R/B19R K-42RB19R
M-42/B20LM-42/B20L M-42B20L
M-42R/B20RM-42R/B20R M-42RB20R
N-55/B24LN-55/B24L N-55B24L
N-55R/B24RN-55R/B24R N-55RB24R
Q-85/D23LQ-85/D23L Q-85D23L
Q-85R/D23RQ-85R/D23R Q-85RD23R
S-95/D26LS-95/D26L S-95D26L
S-95R/D26RS-95R/D26R S-95RD26R

A long-life series for idling-stop and charge-control cars using Furukawa's own UltraBattery, which combines a lead battery with a capacitor. 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/is-urtrabattery.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.