Enerdrive B-TEC Ultra 100Ah vs iTECH120X PRO

What does the extra 20Ah mean on a boat?

At an illustrative average load of 5A, an additional 20Ah corresponds to four hours before allowances. That is a calculation, not a runtime test. A fridge cycles on and off, other equipment shares the bank, and usable reserve depends on your chosen operating limits.

Use a measured daily energy log to decide whether the extra capacity changes your time away from charging. If your charging sources cannot replace yesterday's consumption, adding capacity only delays the shortfall. Compare the complete energy budget rather than buying on the largest label alone.

Case dimensions, water exposure and weight

The Ultra's published footprint is wider and lower; the iTechworld dimensions distinguish the case from the height including terminals. A cardboard mock-up is a useful way to check whether either can pass through the access opening with room left to service the connections.

Do not infer equivalent ingress protection from promotional photographs or the word marine. The Ultra source specifies IP67. Confirm the iTECH120X PRO's current environmental rating and installation instructions directly. Its source also gives two different weights, which we expose in the table instead of silently picking the favourable one.

Compare purchase price with the cost of fitting

Both displayed prices are dated manufacturer selling prices, with delivery outside the comparison. Promotions can change. Recheck the exact model in the basket and obtain a written installation scope before deciding which complete system costs less.

A lower battery price can be offset by different mounting, cables or charging equipment. Conversely, an existing compatible installation might make the lower purchase price meaningful. Neither higher price nor a longer list of features proves longer service life; that would require comparable evidence we do not yet have.

Common battery comparison questions

Sources and comparison method

We matched the exact model codes to the manufacturer documents below on 2 October 2026. The selection advice is our interpretation of those specifications. We have not measured capacity, durability, waterproofing or service quality. We do not turn manufacturer cycle claims into a tested lifespan ranking.

• Enerdrive: B-TEC Ultra model specifications and 100Ah price ↗
• iTechworld: iTECH120X PRO specifications, dimensions and price ↗

Specifications, offers and warranty terms can change. Match the supplied unit to its current manual before purchase. Report a correction with the model code and source.