Which is better for a wheelchair or mobility scooter?

Both are 12V 35Ah sealed lead acid U1 batteries, so either fits the same tray. The UPG has the more complete spec sheet, including a flame-resistant case and valve-regulated venting, which is why it is the safer pick for indoor mobility use.

Is the Mighty Max worth saving about $3?

If you just need a 12V 35Ah U1 battery and the fit is confirmed, yes. The UPG's extra cost buys a published 320 CCA rating and a UL94 V-0 case, which matter more for engine-start and jump-booster use.

Neither maker publishes a cycle count for these two models. Both are AGM sealed lead acid with low self-discharge, and real life depends on depth of discharge and charging. The UPG lists a 3-5 year standby shelf life; Mighty Max does not publish one.

Can I use either one to start an engine?

The UPG is rated 320 CCA, so it can handle light engine-start and jump-booster duty. Mighty Max does not publish a CCA figure for the ML35-12, so do not assume it will crank an engine.

Do they use the same charger?

Yes. Both are 12V sealed lead acid AGM, so a charger with an AGM or sealed lead acid setting at roughly 14.4-14.7V absorption works for either.

Which is cheaper right now?

Mighty Max at $74.98 at Amazon as of November 6, 2026, against $77.69 at eBay for the UPG. The gap is under $3, so shipping and returns may decide it.

Universal Power Group UPG 12V 35Ah Sealed Lead Acid U1 Battery (UB12350) vs Mighty Max Battery Mighty Max 12V 35Ah Sealed Lead Acid U1 Battery (ML35-12)

These are near-identical 12V 35Ah sealed lead acid U1 batteries, and both are priced within a few dollars. The UPG UB12350 is the safer pick if you want a documented deep-cycle AGM with a flame-resistant case and a 320 CCA rating; the Mighty Max ML35-12 is the cheaper option at $74.98 at Amazon as of November 6, 2026, against $77.69 at eBay for the UPG. Buy whichever is in stock when you need it, since the price gap is under $3.

Today the Mighty Max Battery Mighty Max 12V 35Ah Sealed Lead Acid U1 Battery (ML35-12) costs $2.71 less at its best price.

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