Quick answer
Battery maintenance differs between primary cells, rechargeable packs and emergency power. Compare the actual replacement routine before relying on a life claim.
Research shortlist
Battery maintenance differs between primary cells, rechargeable packs and emergency power. Compare the actual replacement routine before relying on a life claim.
| Product | Research use case | Sourced features | Decision limit |
|---|---|---|---|
| Level Lock Pro | Battery chemistry | Battery: One non-rechargeable CR2 lithium; up to 1 year | Level uses a CR2 lithium cell, Schlage four AA alkaline cells and E31 a rechargeable pack. |
| Schlage Encode Plus | Claim conditions | Battery: 4 AA alkaline; up to 6 months typical use | E31 quotes up to 14 months at ten unlocks/day; other claims use different assumptions and are not a common test. |
| eufy Smart Lock E31 | Emergency power | Battery: 10,000 mAh rechargeable; up to 14 months at 10 unlocks/day; Emergency power: Exterior USB-C temporary power; not battery charging | E31 exterior USB-C provides temporary power, not pack charging; ULTRALOQ has no Micro-USB backup interface. |
What to check before buying
| Decision factor | What to establish |
|---|---|
| Battery chemistry | Level uses a CR2 lithium cell, Schlage four AA alkaline cells and E31 a rechargeable pack. |
| Claim conditions | E31 quotes up to 14 months at ten unlocks/day; other claims use different assumptions and are not a common test. |
| Emergency power | E31 exterior USB-C provides temporary power, not pack charging; ULTRALOQ has no Micro-USB backup interface. |
| Friction and backup | Check door alignment and keep documented backup access available rather than compensating for mechanical resistance. |
Level Lock Pro
Why it belongs here: For battery chemistry, the US record documents Battery: One non-rechargeable CR2 lithium; up to 1 year.
Who should consider it: Buyers assessing battery chemistry who can meet the documented Level Lock Pro installation and operating requirements.
Before choosing: Level uses a CR2 lithium cell, Schlage four AA alkaline cells and E31 a rechargeable pack.
Evidence limit: Level Lock Pro is assessed for battery chemistry using manufacturer documentation; this does not establish a comparative security test result.
Full sourced specification recordSchlage Encode Plus
Why it belongs here: For claim conditions, the US record documents Battery: 4 AA alkaline; up to 6 months typical use.
Who should consider it: Buyers assessing claim conditions who can meet the documented Schlage Encode Plus installation and operating requirements.
Before choosing: E31 quotes up to 14 months at ten unlocks/day; other claims use different assumptions and are not a common test.
Evidence limit: Schlage Encode Plus is assessed for claim conditions using manufacturer documentation; this does not establish a comparative security test result.
Full sourced specification recordeufy Smart Lock E31
Why it belongs here: For emergency power, the Australia record documents Battery: 10,000 mAh rechargeable; up to 14 months at 10 unlocks/day; Emergency power: Exterior USB-C temporary power; not battery charging.
Who should consider it: Buyers assessing emergency power who can meet the documented eufy Smart Lock E31 installation and operating requirements.
Before choosing: E31 exterior USB-C provides temporary power, not pack charging; ULTRALOQ has no Micro-USB backup interface.
Evidence limit: eufy Smart Lock E31 is assessed for emergency power using manufacturer documentation; this does not establish a comparative security test result.
Full sourced specification recordHow we chose
Selection centres on battery chemistry, claim conditions, emergency power, friction and backup. Battery maintenance differs between primary cells, rechargeable packs and emergency power. Compare the actual replacement routine before relying on a life claim. This is source-based research, not a hands-on test or star-rated ranking.
Read the complete methodologyCommon questions
Can I charge eufy E31 through its outside USB-C port?
No. The documented exterior interface supplies temporary emergency power; it is not battery charging.
Can I substitute rechargeable AA cells for alkaline?
Only if the exact lock manual approves them; do not transfer battery guidance between models.
Sources and verification
Official documentation consulted 5 October 2026. Specifications are manufacturer statements, not independent measurements. Check the exact regional model before buying.
- Level Lock Pro — Official product or announcement
- Level Lock Pro — Official supporting specifications/support
- Level Lock Pro — Official supporting specifications/support
- Schlage Encode Plus — Official product or announcement
- Schlage Encode Plus — Official supporting specifications/support
- Schlage Encode Plus — Manufacturer knowledge base: Thread
- eufy Smart Lock E31 — Official product or announcement
- eufy Smart Lock E31 — Official supporting specifications/support
